| | English Name | Japanese Name | Castle Type | Castle Condition | Historical Period | Prefecture | Year Visited | AddedJcastle | GPSLocation |
|---|
| Aburakawa Nobue Yashiki | Aburakawa Nobue Yashiki | 油川信恵屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.62068, 138.60005 |
| Ahoyama Castle | Ahoyama Castle | 青山城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2024 | 2024 | 35.05765, 135.85202 |
| Aida Yakata | Aida Yakata | 会田館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.35335, 137.99302 |
| Aika Yashiki | Aika Yashiki | 秋鹿屋敷 | Fortified Manor | Ruins only | Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.71337, 137.84806 |
| Aiki Castle (Minochi) | Aiki Castle (Minochi) | 相木城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.66515, 138.20489 |
| Aimiyamamonomi Fort | Aimiyamamonomi Fort | 逢見山物見砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.02708, 137.90945 |
| Ainuta Fort | Ainuta Fort | 相垈塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72143, 138.45165 |
| Aizu Wakamatsu Castle | Aizu Wakamatsu Castle | 会津若松城 | Hilltop | Reconstructed main keep | Edo Period | Fukushima Prefecture | 1997
1998
2003
2011 | 1999 | 37.48777, 139.9299 |
| Akagi Kita Castle | Akagi Kita Castle | 赤木北城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.16266, 137.97342 |
| Akagi Minami Castle | Akagi Minami Castle | 赤木南城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.15552, 137.97314 |
| Akagi Yakata | Akagi Yakata | 赤木館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.16161, 137.97116 |
| Akahori Castle (Ise) | Akahori Castle (Ise) | 伊勢赤堀城 | Fortified Manor | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.96271, 136.60728 |
| Akaiwa Castle | Akaiwa Castle | 赤岩城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 34.76677, 137.44601 |
| Akasaka Jin'ya | Akasaka Jin'ya | 赤坂陣屋 | Fortified Manor | No main keep but other buildings | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.85605, 137.30672 |
| Akashi Castle | Akashi Castle | 明石城 | Hilltop | No main keep but other buildings | Edo Period | Hyogo Prefecture | 2009
2024 | 2007 | 34.65231, 134.99186 |
| Akashibu Castle (Mikawa) | Akashibu Castle (Mikawa) | 三河赤渋城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92963, 137.13409 |
| Akasu Castle (Ina) | Akasu Castle (Ina) | 伊那赤須城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.72544, 137.95992 |
| Akatsuka Castle | Akatsuka Castle | 赤塚城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2019 | 2020 | 35.78455, 139.64351 |
| Akayama Jin'ya | Akayama Jin'ya | 赤山陣屋 | Flatland | Ruins only | Edo Period | Saitama Prefecture | 2023 | 2023 | 35.85087, 139.74669 |
| Akazawa Yakata | Akazawashi Yakata | 赤沢氏館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.29167, 137.99672 |
| Akechi Castle | Akechi Castle | 明智城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.30359, 137.39445 |
| Akechi Jin'ya | Akechi Jin'ya | 明智陣屋 | Hilltop | Ruins only | Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.30469, 137.39176 |
| Akechi Osayama Castle | Akechi Osayama Castle | 明智長山城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.42205, 137.08468 |
| Aki Castle | Aki Castle | 安芸城 | Hilltop | Ruins only | Pre Edo Period | Kochi Prefecture | Viewer Contributed | 2013 | 33.51947, 133.9125 |
| Akiba Fort (Azumi) | Akiba Fort (Azumi) | 安曇秋葉砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.65417, 137.84308 |
| Akiba Fort (Ina) | Akiba Fort (Ina) | 伊那秋葉砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 35.98695, 137.99545 |
| Akita Castle | Akita Castle | 秋田城 | Flatland | No main keep but other buildings | Pre Edo Period | Akita Prefecture | 2018 | 2012 | 39.74039, 140.07969 |
| Akiyama Yakata | Akiyama Yakata | 秋山館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.583, 138.44543 |
| Akiyoshi Fort | Akiyoshi Fort | 秋吉砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.3648, 138.00819 |
| Akizuki Castle | Akizuki Castle | 秋月城 | Flatland | No main keep but other buildings | Edo Period | Fukuoka Prefecture | Viewer Contributed | 2009 | 33.46607, 130.69543 |
| Akizuki Domain South Detached Palace | Akizuki Domain South Detached Palace | 秋月藩南御殿 | Flatland | Ruins only | Edo Period | Fukuoka Prefecture | Viewer Contributed | 2020 | 33.46163, 130.69534 |
| Ako Castle | Ako Castle | 赤穂城 | Flatland | No main keep but other buildings | Edo Period | Hyogo Prefecture | 2018 | 2009 | 34.74613, 134.38869 |
| Akozu Castle | Akozu Castle | 赤尾津城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Akita Prefecture | Viewer Contributed | 2016 | 39.49801, 140.08997 |
| Akutagawasan Castle | Akutagawasan Castle | 芥川山城 | Mountaintop | Ruins only | Pre Edo Period | Osaka | 2016
2022 | 2013 | 34.88097, 135.58831 |
| Amabiki Castle | Amabiki Castle | 雨引城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.64831, 138.34699 |
| Amaga Castle | Amaga Castle | 天ヶ城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Miyazaki Prefecture | Viewer Contributed | 2012 | 31.96124, 131.29356 |
| Amagasaki Castle | Amagasaki Castle | 尼崎城 | Flatland | Reconstructed main keep | Edo Period | Hyogo Prefecture | 2013 | 2013 | 34.71711, 135.41852 |
| Amagata Castle | Amagata Castle | 天方城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.84768, 137.9496 |
| Amanari Castle | Amanari Castle | 雨鳴城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.58719, 138.42136 |
| Amari Yakata | Amari Yakata | 甘利館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.68867, 138.4427 |
| Amemiya Yashiki | Amemiya Yashiki | 雨宮屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.64325, 138.69219 |
| Ametoya Castle | Ametoya Castle | 雨戸屋城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.36521, 137.98 |
| Amidadou Castle (Omi) | Amidadou Castle (Omi) | 近江阿弥陀堂城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.20218, 136.15954 |
| Amidagamine Castle (Yamashiro) | Amidagamine Castle (Yamashiro) | 山城阿弥陀ヶ峰城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | Viewer Contributed
2022 | 2022 | 34.98822, 135.78478 |
| Amino Shingozaemon Yashiki | Amino Shingozaemon Yashiki | 網野新五左衛門屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72146, 138.70933 |
| Amino Yashiki | Amino Yashiki | 網野屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.71966, 138.712 |
| Anjou Jin'ya | Anjou Jin'ya | 安城陣屋 | Flatland | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.94703, 137.09431 |
| Annaka Castle | Annaka Castle | 安中城 | Hilltop | No main keep but other buildings | Edo Period | Gunma Prefecture | 2018 | 2018 | 36.32939, 138.89655 |
| Ano Yakata | Ano Yakata | 阿野館 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2023 | 35.14224, 138.7955 |
| Anrakuji Yakata | Anrakuji Yakata | 安楽寺館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.30889, 137.8368 |
| Ansho Castle | Ansho Castle | 安祥城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | 2009 | 2009 | 34.94555, 137.09916 |
| Anshouko Castle | Anshouko Castle | 安祥古城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.94765, 137.09107 |
| Aoiyama Castle | Aoiyama Castle | 青井山城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.49361, 135.73204 |
| Aoki Castle (Azumi) | Aoki Castle (Azumi) | 安曇青木城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.48358, 137.88329 |
| Aoki Castle (Sakata) | Aoki Castle (Sakata) | 近江坂田青木城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.32974, 136.32179 |
| Aono Castle (Mikawa) | Aono Castle (Mikawa) | 三河青野城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92341, 137.12169 |
| Aoyagi Castle | Aoyagi Castle | 青柳城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | 2015 | 2016 | 36.43089, 138.03387 |
| Aoyagi Yakata | Aoyagi Yakata | 青柳館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.43079, 138.02695 |
| Aoyama Castle | Aoyama Castle | 青山城 | Mountaintop | Ruins only | Pre Edo Period | Saitama Prefecture | 2015 | 2015 | 36.03746, 139.26793 |
| Aoyama Castle (Nagato) | Aoyama Castle (Nagato) | 長門青山城 | Mountaintop | Ruins only | Pre Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 34.01863, 130.96367 |
| Aoyama Castle (Omi) | Aoyama Castle | 青山城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.09672, 136.26776 |
| Aoyama Yashiki (Mikawa) | Aoyama Yashiki (Mikawa) | 三河青山屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.91877, 137.3011 |
| Ara Castle (Ina) | Ara Castle (Ina) | 小出荒城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.81878, 137.93876 |
| Ara Castle (Murakami Clan Fort Network) | Ara Castle (Murakami Clan Fort Network) | 村上荒城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.42649, 138.25265 |
| Aragaito Fort | Aragaito Fort | 荒海渡砦 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.21128, 137.84487 |
| Arahorinaiki Yashiki | Arahorinaiki Yashiki | 荒堀内記屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.57603, 138.18508 |
| Arai Castle | Arai Castle | 荒井城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.231, 137.95034 |
| Araihara Castle | Araihara Castle | 荒井原城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.67045, 138.36189 |
| Araino Castle (Mikawa) | Araino Castle (Mikawa) | 三河荒井野城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.9171, 137.27701 |
| Arako Castle | Arako Castle | 荒子城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 35.13511, 136.8563 |
| Arashi Castle | Arashi Castle | 嵐城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.08807, 137.96875 |
| Aratame Castle | Aratame Castle | 新田目城 | Flatland | Ruins only | Pre Edo Period | Yamagata Prefecture | Viewer Contributed | 2023 | 38.96799, 139.88879 |
| Arato Castle | Arato Castle | 荒砥城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | 2008 | 2008 | 36.47987, 138.13676 |
| Aratoshou Castle | Aratoshou Castle | 荒砥小城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.47965, 138.13447 |
| Arayama Castle | Arayama Castle | 荒山城 | Mountaintop | Ruins only | Pre Edo Period | Ishikawa Prefecture | Viewer Contributed | 2019 | 36.9548, 136.94477 |
| Arikoyama Castle | Arikoyama Castle | 有子山城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | 2013 | 2013 | 35.45545, 134.87812 |
| Aruga Castle | Aruga Castle | 有賀城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.01732, 138.08084 |
| Asaba Castle | Asaba Castle | 麻場城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2015 | 2016 | 36.24762, 138.94259 |
| Asada Castle (Chikuma) | Asada Castle (Chikuma) | 筑摩浅田城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.1646, 137.99705 |
| Asahara Yakata | Asahara Yakata | 浅原館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.19298, 136.16147 |
| Asahi Castle (Chikuma) | Asahi Castle (Chikuma) | 筑摩旭城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2019 | 36.1388, 137.86029 |
| Asahi Castle (Minochi) | Asahi Castle (Minochi) | 水内旭城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.65261, 138.17139 |
| Asahi Castle (Owari) | Asahi Castle (Owari) | Owari-Asahijō | Mountaintop | Reconstructed main keep | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2019 | 35.21926, 137.02857 |
| Asahi Moated Settlement | Asahi Moated Settlement | 朝日環濠集落 | Flatland | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.2185, 136.85134 |
| Asahiyama Castle | Asahiyama Castle | 旭山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.65444, 138.16278 |
| Asahiyama Castle (Kai) | Asahiyama Castle (Kai) | 甲斐旭山城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.85261, 138.42724 |
| Asaka Castle (Chikuma) | Asaka Castle (Chikuma) | Chikuma-Asakajō | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.44489, 138.06209 |
| Asakura Yakata | Asakura Yakata | 朝倉館 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Fukui Prefecture | 2023 | 2023 | 35.99946, 136.29593 |
| Asama Palace | Asama Palace | 浅間御殿 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.26592, 137.99172 |
| Asama Yakata | Asama Yakata | 浅間館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.26341, 137.98548 |
| Asano Castle | Asano Castle | 浅野城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 35.29689, 136.82787 |
| Ashigara Castle | Ashigara Castle | 足柄城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | 2010 | 2010 | 35.32088, 139.01183 |
| Ashikaga Masauji Yakata | Ashikaga Masauji Yakata | 足利政氏館 | Fortified Manor | Ruins only | Pre Edo Period | Saitama Prefecture | 2023 | 2023 | 36.07376, 139.66851 |
| Ashikagashi Yakata | Ashikagashi Yakata | 足利氏館 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Tochigi Prefecture | 2007 | 2007 | 36.33771, 139.45168 |
| Ashimori Jin'ya | Ashimori Jin'ya | 足守陣屋 | Flatland | No main keep but other buildings | Edo Period | Okayama Prefecture | Viewer Contributed | 2022 | 34.7299, 133.80069 |
| Ashinoya Jin'ya | Ashinoya Jin'ya | 芦谷陣屋 | Flatland | No main keep but other buildings | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.85829, 137.16873 |
| Asonuma Castle | Asonuma Castle | 阿曽沼城 | Flatland | Ruins only | Pre Edo Period | Tochigi Prefecture | 2017 | 2017 | 36.31094, 139.58723 |
| Asou Castle (Mikawa) | Asou Castle (Mikawa) | 三河麻生城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.98804, 137.30314 |
| Asouko Castle (Mikawa) | Asouko Castle (Mikawa) | 三河麻生古城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.98908, 137.3011 |
| Asukayama Castle | Asukayama Castle | 飛鳥山城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2021 | 2022 | 35.75047, 139.73882 |
| Asuke Castle | Asuke Castle | 足助城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Aichi Prefecture | 2019 | 2017 | 35.13447, 137.32534 |
| Asuke Jin'ya | Asuke Jin'ya | 足助陣屋 | Flatland | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.13731, 137.31749 |
| Atagoyama Noroshidai | Atagoyama Noroshidai | 愛宕山烽火台 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.66948, 138.58067 |
| Atsushiba Yashiki (Koma) | Atsushiba Yashiki (Koma) | 巨摩厚芝屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.75053, 138.45119 |
| Awaji Castle (Chikuma) | Awaji Castle (Chikuma) | 筑摩淡路城 | Fortified Manor | Ruins only | Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.19572, 137.84964 |
| Awaya Yakata | Awaya Yakata | 粟屋館 | Fortified Manor | Ruins only | Pre Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.6118, 135.96265 |
| Awazawa Castle (Suwa) | Awazawa Castle (Suwa) | 諏訪粟沢城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 35.99796, 138.17575 |
| Aya Castle | Aya Castle | 綾城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Miyazaki Prefecture | Viewer Contributed | 2007 | 32.00336, 131.24904 |
| Ayukawa Castle (Koka) | Ayukawa Castle (Koka) | 鮎河城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2023 | 2023 | 34.95723, 136.34561 |
| Azai Higashi Castle | Azai Higashi Castle | 浅井東城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.88966, 137.10637 |
| Azai Nishi Castle | Azai Nishi Castle | 浅井西城 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.888, 137.10122 |
| Azuchi Castle | Azuchi Castle | 安土城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | 2004
2011
2021 | 2004 | 35.15593, 136.13928 |
| Baba Noroshidai | Baba Noroshidai | 馬場烽火台 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.83643, 138.47327 |
| Baba Yashiki | Baba Yashiki | 馬場屋敷 | Fortified Manor | No main keep but other buildings | Edo Period | Nagano Prefecture | Viewer Contributed | 2019 | 36.16734, 137.98551 |
| Baba Yashiki (Kai) | Baba Yashiki (Kai) | 甲斐馬場屋敷 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.80828, 138.32756 |
| Banba Castle | Banba Castle | 番場城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2025 | 35.30523, 136.3105 |
| Beffu Castle (Koka) | Kouka Beffu Castle | 甲賀別府城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 34.89945, 136.21028 |
| Binmanji Castle | Binmanji Castle | 敏満寺城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2024 | 35.21938, 136.28291 |
| Bitchu Matsuyama Castle | Bitchu Matsuyama Castle | 備中松山城 | Mountaintop | Original main keep | Edo Period | Okayama Prefecture | 2010
2024 | 2004 | 34.80891, 133.62219 |
| Bitchu Takamatsu Castle | Bitchu Takamatsu Castle | 備中高松城 | Flatland | Ruins only | Pre Edo Period | Okayama Prefecture | Viewer Contributed | 2012 | 34.69281, 133.82206 |
| Biwa Castle (Kai) | Biwa Castle (Kai) | 甲斐琵琶城 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.74316, 138.69329 |
| Bizen Date (Uzen) | Bizen Date (Uzen) | 羽前備前館 | Fortified Manor | Ruins only | Pre Edo Period | Yamagata Prefecture | Viewer Contributed | 2023 | 38.67896, 139.83212 |
| Bizenhara Yakata | Bizenhara Yakata | 備前原館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.34876, 137.99424 |
| Bodaiyama Castle | Bodaiyama Castle | 菩提山城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.39294, 136.48322 |
| Bue Yakata (Totomi) | Bue Yakata (Totomi) | 遠江武衛館 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.72565, 138.10891 |
| Busetsu Castle | Busetsu Castle | 武節城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2022 | 35.21375, 137.50525 |
| Bushihara Fort | Bushihara Fort | 武士原塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.71977, 138.70812 |
| Chamachi Battery (Obama Domain) | Obama Domain Chamachi Battery | 小浜藩茶町台場 | Flatland | Ruins only | Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.6575, 136.06523 |
| Chausudate | Chausudate | 茶臼館 | Mountaintop | Ruins only | Pre Edo Period | Akita Prefecture | 2020 | 2021 | 40.16746, 140.10799 |
| Chausuyama Castle (Chikuma) | Chausuyama Castle (Chikuma) | 筑摩茶臼山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.35588, 137.93716 |
| Chausuyama Castle (Nukata) | Chausuyama Castle (Nukata) | 額田茶臼山城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.83906, 137.11792 |
| Chausuyama Castle (Shinano) | Chausuyama Castle (Shinano) | 信濃茶臼山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.26686, 137.98729 |
| Chiba Castle | Chiba Castle | 千葉城 | Hilltop | Reconstructed main keep | Pre Edo Period | Chiba Prefecture | 2009 | 2009 | 35.60471, 140.12679 |
| Chifuruya Castle (Sanada) | Chifuruya Castle (Sanada) | 真田千古屋城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.44808, 138.29245 |
| Chigasaki Castle | Chigasaki Castle | 茅ヶ崎城 | Hilltop | Ruins only | Pre Edo Period | Kanagawa Prefecture | 2010 | 2009 | 35.54474, 139.5791 |
| Chihaya Castle | Chihaya Castle | 千早城 | Mountaintop | Ruins only | Pre Edo Period | Osaka | Viewer Contributed
2025 | 2014 | 34.4162, 135.65294 |
| Chikaoka Castle | Chikaoka Castle | 近岡城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.12683, 137.29722 |
| Chikatou Fort | Chikatou Fort | 千鹿頭砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.22084, 137.99342 |
| Chikuma Goten'yama Castle | Chikuma Goten'yama Castle | 筑摩御殿山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.26742, 137.95321 |
| Chikusa Castle | Chikusa Castle | 千種城 | Mountaintop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2024 | 35.03277, 136.48592 |
| Chikuzenbara Fort | Chikuzenbara Fort | 筑前原塁 | Flatland | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.64687, 138.68065 |
| Chimura Yashiki | Chimura Yashiki | 千村屋敷 | Fortified Manor | Ruins only | Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.40325, 137.11016 |
| Chinaha Castle | Chinaha Castle | 伊敷索城 | Hilltop | Ruins only | Pre Edo Period | Okinawa Prefecture | | 2024 | 26.34226, 126.76306 |
| Chinen Castle | Chinen Castle | 知念城 | Mountaintop | Ruins only | Pre Edo Period | Okinawa Prefecture | Viewer Contributed | 2023 | 26.1604, 127.8119 |
| Chiran Castle | Chiran Castle | 知覧城 | Hilltop | Ruins only | Pre Edo Period | Kagoshima Prefecture | Viewer Contributed | 2013 | 31.36691, 130.4429 |
| Chofuku Castle | Chofuku Castle | 長福城 | Flatland | Ruins only | Pre Edo Period | Tochigi Prefecture | 2018 | 2018 | 36.30955, 139.79495 |
| Chouja Yashiki (Totomi) | Chouja Yashiki (Totomi) | 遠江長者屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.77842, 137.84142 |
| Choujaike Yakata | Choujaike Yakata | 長者池館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.42273, 137.89887 |
| Choujayama Castle | Chojayama Castle | 長者山城 | Hilltop | Ruins only | Pre Edo Period | Ibaraki Prefecture | Viewer Contributed | 2020 | 36.41235, 140.4336 |
| Choujayashiki Yakata | Choujayashiki Yakata | 長者屋敷館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.16485, 137.94641 |
| Choukokuji Fort | Choukokuji Fort | 長谷寺砦 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.67433, 138.63075 |
| Chousenji Fort | Chousenji Fort | 長泉寺塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.78902, 138.42071 |
| Choushouin Yakata | Choshoin Yakata | 長性院館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.5016, 137.85559 |
| Chouzenjimae Jin'ya | Chouzenjimae Jin'ya | 長禅寺前陣屋 | Flatland | Ruins only | Edo Period | Yamanashi Prefecture | Viewer Contributed | 2021 | 35.66363, 138.57558 |
| Daikan Yashiki | Daikan Yashiki | 代官屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 35.0372, 137.31663 |
| Daikan'yama Fort | Daikan'yama Fort | 代官山砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.09881, 138.00911 |
| Daikan'yashiki Castle | Daikan'yashiki Castle | 代官屋敷城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 35.03896, 137.31752 |
| Daikannon Castle | Daikannon Castle | 大観音城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.14097, 137.32366 |
| Dainenji Yakata | Dainenji Yakata | 大念寺館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.50527, 137.85717 |
| Daita Castle | Daita Castle | 大田城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.06053, 137.24228 |
| Daiun'in Doi | Daiun'in Doi | 大雲院土居 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2022 | 35.31533, 138.95309 |
| Damine Castle | Damine Castle | 田峯城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.05494, 137.53458 |
| Damine Yashiki | Damine Yashiki | 田峯屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.05298, 137.53137 |
| Dannoura Battery | Dannoura Battery | 壇ノ浦台場 | Flatland | Ruins only | Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 33.96538, 130.95682 |
| Deura Castle | Deura Castle | 出浦城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.45297, 138.15385 |
| Do Castle (Mikawa) | Do Castle (Mikawa) | 三河土城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.98306, 137.28761 |
| Dodo Fort | Dodo Fort | 百々砦 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.96334, 137.25094 |
| Dohiyama Castle (Nagato) | Dohiyama Castle (Nagato) | 長門土肥山城 | Fortified Manor | Ruins only | Pre Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 33.99596, 130.98648 |
| Doi Castle (Mikawa) | Doi Castle (Mikawa) | 三河土井城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.92161, 137.13429 |
| Doi Tono Yashiki | Doi Tono Yashiki | 土肥殿屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2025 | |
| Dokanyama | Dokanyama | 道灌山 | Mountaintop | Ruins only | Pre Edo Period | Tokyo | 2021 | 2022 | 35.73148, 139.76663 |
| Dokyou Castle | Dokyou Castle | 土京城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.69473, 138.22675 |
| Dota Castle (Mino) | Dota Castle (Mino) | 美濃土田城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.41738, 137.00807 |
| Doudo Castle (Mikawa) | Doudo Castle (Mikawa) | 三河百々城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.9888, 137.17424 |
| Dousawa Fort | Dousawa Fort | 堂沢砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.69399, 138.21724 |
| Doushou Hori | Doushou Hori | 道生堀 | Flatland | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.56303, 138.90289 |
| Ebe Castle (Omi) | Ebe Castle (Omi) | 近江江部城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.09428, 136.03704 |
| Eboshigata Castle | Eboshigata Castle | 烏帽子形城 | Mountaintop | Ruins only | Edo Period | Osaka | 2022 | 2023 | 34.44464, 135.56465 |
| Echizen Katsuyama Castle | Echizen Katsuyama Castle | 越前勝山城 | Flatland | Reconstructed main keep | Edo Period | Fukui Prefecture | Viewer Contributed | 2010 | 36.06083, 136.50052 |
| Echizen Ohno Castle | Echizen Ohno Castle | 越前大野城 | Mountaintop | Reconstructed main keep | Edo Period | Fukui Prefecture | Viewer Contributed | 2007 | 35.98661, 136.4831 |
| Edo Castle | Edo Castle | 江戸城 | Hilltop | No main keep but other buildings | Edo Period | Tokyo | 1992
2001
2003
2004
2011
2012
2013
2014
2015
2016
2017
2018
2019
2022
2023 | 1999 | 35.68824, 139.75432 |
| Egawa Fort | Egawa Fort | 江川砦 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2021 | 35.0535, 138.95915 |
| Eimeiin Fort | Eimeiin Fort | 永明院塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.69375, 138.43649 |
| Ema Yakata | Ema Yakata | 江馬館 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2019 | 36.32622, 137.30951 |
| Enryakuji | Enryakuji | 延暦寺 | Mountaintop | No main keep but other buildings | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.07082, 135.84075 |
| Enryakuji Amidadou Fort | Enryakuji Amidadou Fort | 延暦寺阿弥陀堂砦 | Mountaintop | No main keep but other buildings | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.06931, 135.83793 |
| Enryakuji Higashitani Fort | Enryakuji Higashitani Fort | 延暦寺東谷砦 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.07433, 135.8358 |
| Enryakuji Joudoin Fort | Enryakuji Joudoin Fort | 延暦寺浄土院砦 | Mountaintop | No main keep but other buildings | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.07144, 135.83626 |
| Enryakuji Kitatani Fort | Enryakuji Kitatani Fort | 延暦寺北谷砦 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.07238, 135.83972 |
| Enryakuji Monjurou Fort | Enryakuji Monjurou Fort | 延暦寺文殊楼砦 | Mountaintop | No main keep but other buildings | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.07045, 135.84205 |
| Enryakuji Nishitani Fort | Enryakuji Nishitani Fort | 延暦寺西谷砦 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.07602, 135.83404 |
| Enryakuji Shakadou Fort | Enryakuji Shakadou Fort | 延暦寺釈迦堂砦 | Mountaintop | No main keep but other buildings | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.07421, 135.83378 |
| Fubukikaito Castle (Ina) | Fubukikaito Castle (Ina) | 小出フブキ外垣城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.81649, 137.93961 |
| Fuchu Castle (Hitachi) | Fuchu Castle (Hitachi) | 常陸府中城 | Flatland | No main keep but other buildings | Edo Period | Ibaraki Prefecture | Viewer Contributed | 2022 | 36.19029, 140.27019 |
| Fudoudou Yakata | Fudoudou Yakata | 不動堂館 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.09202, 137.17407 |
| Fujihashi Castle (Tokyo) | Fujihashi Castle (Tokyo) | 藤橋城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2015 | 2015 | 35.80393, 139.30046 |
| Fujii Castle (Mikawa) | Fujii Castle (Mikawa) | 三河藤井城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 34.89241, 137.08419 |
| Fujikake Jin'ya | Fujikake Jin'ya | 藤懸陣屋 | Flatland | Ruins only | Edo Period | Kyoto | 2024 | 2024 | 35.35903, 135.40513 |
| Fujikawa Castle (Mikawa) | Fujikawa Castle (Mikawa) | 三河藤川城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.9105, 137.21907 |
| Fujimaki Castle | Fujimaki Castle | 藤牧城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.59521, 138.17111 |
| Fujimaki Yashiki | Fujimaki Yashiki | 藤巻屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.77261, 138.42604 |
| Fujimaru Yakata | Fujimaru Yakata | 藤丸館 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.72534, 138.10634 |
| Fujita Castle | Fujita Castle | 藤田城 | Hilltop | No main keep but other buildings | Pre Edo Period | Fukushima Prefecture | Viewer Contributed | 2017 | 37.18184, 140.42305 |
| Fukakusa Yakata | Fukakusa Yakata | 深草館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2020 | 35.84646, 138.38364 |
| Fukayama Castle (Suruga) | Fukayama Castle (Suruga) | 駿河深山城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2023 | 35.25001, 138.84058 |
| Fukazawa Castle | Fukazawa Castle | 深沢城 | Flatland | No main keep but other buildings | Pre Edo Period | Shizuoka Prefecture | 2014 | 2014 | 35.32499, 138.95666 |
| Fukigabora Castle | Fukigabora Castle | 吹ヶ洞城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.40003, 137.07815 |
| Fukouzu Castle | Fukouzu Castle | 深溝城 | Flatland | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.8395, 137.17682 |
| Fukuchiyama Castle | Fukuchiyama Castle | 福知山城 | Hilltop | Reconstructed main keep | Edo Period | Kyoto | Viewer Contributed
2021 | 2009 | 35.2968, 135.12952 |
| Fukui Castle | Fukui Castle | 福井城 | Flatland | No main keep but other buildings | Edo Period | Fukui Prefecture | 2006
2023 | 2006 | 36.06495, 136.22184 |
| Fukui Castle (Shinano) | Fukui Castle (Shinano) | 信濃福井城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.66392, 138.39509 |
| Fukujima Castle (Takai) | Fukujima Castle (Takai) | 高井福島城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.64181, 138.26717 |
| Fukuju Fort (Odani Castle) | Fukuju Fort (Odani Castle) | 小谷城福寿砦 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2024 | 35.46085, 136.26913 |
| Fukuoka Castle | Fukuoka Castle | 福岡城 | Hilltop | No main keep but other buildings | Edo Period | Fukuoka Prefecture | Viewer Contributed | 2006 | 33.58439, 130.38311 |
| Fukuouji Yakata | Fukuoji Yakata | 福応寺館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.1926, 137.92736 |
| Fukurouga Castle | Fukurouga Castle | 梟ヶ城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.0671, 137.23726 |
| Fukushima Castle | Fukushima Castle | 福島城 | Flatland | Ruins only | Pre Edo Period | Fukushima Prefecture | Viewer Contributed | 2016 | 37.75045, 140.46893 |
| Fukushima Castle (Echigo) | Fukushima Castle (Echigo) | 越後福嶋城 | Flatland | Ruins only | Edo Period | Niigata Prefecture | Viewer Contributed | 2017 | 37.18148, 138.25536 |
| Fukushima Castle (Kiso) | Fukushima Castle (Kiso) | 木曽福島城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.85485, 137.69432 |
| Fukutake Castle (Chikuzen) | Fukutake Castle (Chikuzen) | 筑前福嶽城 | Mountaintop | Ruins only | Pre Edo Period | Fukuoka Prefecture | Viewer Contributed | 2020 | 33.46638, 130.69046 |
| Fukuyama Castle | Fukuyama Castle | 福山城 | Hilltop | Reconstructed main keep | Edo Period | Hiroshima Prefecture | 2009
2023 | 2006 | 34.49103, 133.36112 |
| Fukuyo Castle | Fukuyo Castle | 福与城城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.89595, 138.0003 |
| Fukuzawa Yakata | Fukuzawa Yakata | 福沢館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.44269, 138.16361 |
| Fukuzuka Castle (Mino) | Mino Fukuzuka Castle | 美濃福束城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2022 | 35.30037, 136.6243 |
| Fumimichi Castle | Fumimichi Castle | 文道城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.69048, 138.01484 |
| Funagatayama Castle | Funagatayama Castle | 船形山城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 34.74524, 137.46773 |
| Funage Castle | Funage Castle | 船上城 | Flatland | Ruins only | Pre Edo Period | Hyogo Prefecture | 2024 | 2024 | 34.64791, 134.97495 |
| Funai Castle | Funai Castle | 府内城 | Flatland | No main keep but other buildings | Edo Period | Oita Prefecture | Viewer Contributed | 2012 | 33.24064, 131.61143 |
| Funaki Castle (Omi) | Funaki Castle (Omi) | 近江船木城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.13841, 136.07513 |
| Funaoka Castle | Funaoka Castle | 船岡城 | Mountaintop | Ruins only | Pre Edo Period | Miyagi Prefecture | Viewer Contributed | 2017 | 38.05508, 140.75873 |
| Funaokayama Castle | Funaokayama Castle | 船岡山城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | Viewer Contributed | 2020 | 35.03937, 135.74204 |
| Funayama Castle | Funayama Castle | 船山城 | Mountaintop | Ruins only | Pre Edo Period | Hiroshima Prefecture | 2018 | 2019 | 34.67347, 132.69738 |
| Funayama Castle (Mikawa) | Funayama Castle (Mikawa) | 三河舟山城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.9255, 137.209 |
| Funehiki Castle | Funehiki Castle | 船引城 | Hilltop | Ruins only | Pre Edo Period | Fukushima Prefecture | Viewer Contributed | 2016 | 37.43697, 140.57392 |
| Furuhata Yakata | Furuhata Yakata | 古畑館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.93958, 137.78559 |
| Furui Castle (Mikawa) | Furui Castle (Mikawa) | 三河古井城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.93612, 137.09642 |
| Furujiro Fort | Furujiro Fort | 古城砦 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.67242, 138.625 |
| Furujou Yakata | Furujou Yakata | 古城館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.49636, 137.86537 |
| Furujouyama Castle (Hanishina) | Furujouyama Castle (Hanishina) | 埴科古城山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.59659, 138.2315 |
| Furukawa Castle | Furukawa Castle | 古川城 | Hilltop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2022 | 36.22331, 137.18245 |
| Furumaya Castle (Azumi) | Furumaya Castle (Azumi) | 安曇古厩城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.37221, 137.84934 |
| Furumaya Yakata | Furumaya Yakata | 安曇古厩館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.37138, 137.86431 |
| Furumiya Castle | Furumiya Castle | 古宮城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.97263, 137.4278 |
| Furumiya Castle (Kai) | Furumiya Castle (Kai) | 甲斐古宮城 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.85163, 138.44484 |
| Furusutobaru Ruins | Furusutobaru Ruins | フルスト原遺跡 | Hilltop | Ruins only | Pre Edo Period | Okinawa Prefecture | | 2024 | 24.35073, 124.19525 |
| Furuwatari Castle | Furuwatari Castle | 古渡城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 35.15184, 136.90094 |
| Fuse Castle (Sarashina) | Fuse Castle (Sarashina) | 更級布施城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.57811, 138.14117 |
| Fuseya Castle | Fuseya Castle | 伏屋城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2024 | 35.38517, 136.79417 |
| Fuseyachouja Yakata | Fuseyachouja Yakata | 伏屋長者館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.90949, 138.2235 |
| Fushimi Castle | Fushimi Castle | 伏見城 | Flatland | Reconstructed main keep | Pre Edo Period | Kyoto | 2022 | 2004 | 34.94123, 135.77915 |
| Fusou Castle (Mikawa) | Fusou Castle (Mikawa) | 三河不相城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.81642, 137.23558 |
| Fusumada Castle | Fusumada Castle | 伏馬田城 | Mountaintop | Ruins only | Pre Edo Period | Kanagawa Prefecture | Viewer Contributed | 2023 | 35.56111, 139.15756 |
| Futae Castle (Azumi) | Futae Castle (Azumi) | 安曇二重城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.55809, 137.88732 |
| Futamata Castle | Futamata Castle | 二俣城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | 2020 | 2010 | 34.86212, 137.80941 |
| Futatsu Bungonokami Yakata | Futatsu Bungonokami Yakata | 二木豊後守館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.2556, 137.89455 |
| Futatsugi Castle (Azumi) | Futatsugi Castle (Azumi) | 安曇二木城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.25972, 137.8862 |
| Futoge Castle | Futoge Castle | 二曲城 | Mountaintop | Ruins only | Pre Edo Period | Ishikawa Prefecture | Viewer Contributed | 2017 | 36.35728, 136.60102 |
| Futoh'yama Castle | Futohyama Castle | 太尾山城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2020 | 35.3147, 136.29874 |
| Futsukamachi Castle | Futsukamachi Castle | 二日町城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2024 | 35.89469, 136.84789 |
| Futta Castle (Suwa) | Futta Castle (Suwa) | 諏訪古田城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.00569, 138.17878 |
| Fuwa no Seki | Fuwa no Seki | 不破関 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2024 | 35.35773, 136.46022 |
| Gakiyama Noroshidai | Gakiyama Noroshidai | 餓鬼山烽火台 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.03086, 138.12783 |
| Gakuden Castle (Owari) | Gakuden Castle (Owari) | 尾張楽田城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 35.32818, 136.95052 |
| Ganjaku Castle | Ganjaku Castle | 岩石城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Fukuoka Prefecture | Viewer Contributed | 2013 | 33.57136, 130.86415 |
| Ganryakuji Castle | Ganryakuji Castle | 岩略寺城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.86559, 137.28693 |
| Ganshouin Yakata | Ganshouin Yakata | 岩松院館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.69827, 138.33471 |
| Garyuzan Castle | Garyuzan Castle | 臥龍山城 | Mountaintop | No main keep but other buildings | Edo Period | Gifu Prefecture | Viewer Contributed | 2024 | 35.20556, 136.60775 |
| Gassan Toda Castle | Gassan Toda Castle | 月山富田城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Shimane Prefecture | 2010 | 2011 | 35.3608, 133.18543 |
| Genbao Castle | Genbao Castle | 玄蕃尾城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | 2023 | 2023 | 35.59783, 136.17662 |
| Genga Yashiki (Kai) | Genga Yashiki (Kai) | 甲斐玄賀屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.61643, 138.53007 |
| Genji Yakata (Kai) | Genji Yakata (Kai) | 甲斐源氏館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2021 | 35.55807, 138.50652 |
| Gentairi Castle | Gentairi Castle | 源太入城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.60925, 138.32806 |
| Gifu Castle | Gifu Castle | 岐阜城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Gifu Prefecture | 1992
1996
2019 | 1999 | 35.43391, 136.7819 |
| Gion Castle | Gion Castle | 祗園城 | Flatland | Ruins only | Pre Edo Period | Tochigi Prefecture | 2018 | 2018 | 36.31981, 139.80005 |
| Gobara Castle | Gobara Castle | 郷原城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2016 | 2016 | 36.5526, 138.79976 |
| Gochaku Castle | Gochaku Castle | 御着城 | Flatland | Ruins only | Pre Edo Period | Hyogo Prefecture | 2019 | 2020 | 34.81852, 134.7409 |
| Goi Castle (Mikawa) | Goi Castle (Mikawa) | 三河五井城 | Hilltop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.83845, 137.24463 |
| Gokan Castle | Gokan Castle | 後閑城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2015 | 2016 | 36.3296, 138.84164 |
| Goma Nakamura Castle | Goma Nakamura Castle | 胡麻中村城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2024 | 2025 | 35.2003, 135.47942 |
| Gongen Yakata | Gongen Yakata | 権現館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.13745, 137.97856 |
| Gongen'yama Castle (Mino) | Gongen'yama Castle (Mino) | 美濃権現山城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.4255, 137.14082 |
| Goryokaku Fort | Goryokaku Fort | 五稜郭 | Flatland | No main keep but other buildings | Edo Period | Hokkaido | 2002 | 2002 | 41.79688, 140.75675 |
| Goryoudaira Fort | Goryoudaira Fort | 御領平塁 | Flatland | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.78246, 138.4345 |
| Goryu Castle | Goryu Castle | 五龍城 | Mountaintop | Ruins only | Pre Edo Period | Hiroshima Prefecture | 2023 | 2023 | 34.69741, 132.75286 |
| Gouda Fort | Gouda Fort | 郷田砦 | Mountaintop | Ruins only | Pre Edo Period | Toyama Prefecture | Viewer Contributed | 2021 | 36.67676, 137.3692 |
| Goudo Castle | Goudo Castle | 顔戸城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.43875, 137.10738 |
| Goudo Noroshidai | Goudo Noroshidai | 神戸烽火台 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.86711, 138.50399 |
| Gujo Hachiman Castle | Gujo Hachiman Castle | 郡上八幡城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Gifu Prefecture | 2004 | 2004 | 35.75308, 136.96136 |
| Gushikawa Castle (Itoman Okinawa) | Gushikawa Castle (Itoman Okinawa) | 具志川城 | Flatland | Ruins only | Pre Edo Period | Okinawa Prefecture | Viewer Contributed | 2023 | 26.08036, 127.66452 |
| Gushikawa Castle (Kumejima Okinawa) | Gushikawa Castle (Kumejima Okinawa) | 具志川城 | Hilltop | Ruins only | Pre Edo Period | Okinawa Prefecture | | 2024 | 26.38327, 126.75102 |
| Ha Castle | Ha Castle | 羽城 | Flatland | No main keep but other buildings | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.8774, 136.98434 |
| Haba Castle | Haba Castle | 羽場城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.95634, 137.98449 |
| Habako Castle | Habako Castle | 羽場古城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.95773, 137.9806 |
| Habauehori Yashiki | Habauehori Yashiki | 巾上堀屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.30262, 137.88416 |
| Habu Castle | Habu Castle | 埴生城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2023 | 2024 | 35.05556, 135.44747 |
| Hachigata Castle | Hachigata Castle | 鉢形城 | Hilltop | No main keep but other buildings | Pre Edo Period | Saitama Prefecture | 2006 | 2006 | 36.10724, 139.19362 |
| Hachikenchōja Castle | Hachikenchōja Castle | 八間長者城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.15379, 138.01233 |
| Hachiman'yama Castle (Tanba) | Hachiman'yama Castle (Tanba) | 丹波八幡山城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | Viewer Contributed | 2021 | 35.1305, 135.0795 |
| Hachimanpara Jinsho | Hachimanpara Jinsho | 八幡原陣所 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.59082, 138.18699 |
| Hachimanshita Battery (Obama Domain) | Obama Domain Hachimanshita Battery | 小浜藩八幡下台場 | Flatland | Ruins only | Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.49342, 135.73694 |
| Hachinohe Castle | Hachinohe Castle | 八戸城 | Hilltop | No main keep but other buildings | Pre Edo Period | Aomori Prefecture | 2010 | 2010 | 40.5139, 141.48828 |
| Hachioji Castle | Hachioji Castle | 八王子城 | Mountaintop | Ruins only | Pre Edo Period | Tokyo | 2002
2013
2015 | 2002 | 35.65314, 139.25304 |
| Hadanashi Castle | Hadanashi Castle | 秦梨城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.9525, 137.24825 |
| Hadanashiyama Castle | Hadanashiyama Castle | 秦梨山城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.94674, 137.2497 |
| Haga Castle | Haga Castle | 波賀城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Hyogo Prefecture | Viewer Contributed | 2011 | 35.1596, 134.55041 |
| Hagi Castle | Hagi Castle | 萩城 | Flatland | No main keep but other buildings | Edo Period | Yamaguchi Prefecture | 2014
2024 | 2007 | 34.41767, 131.38344 |
| Hagikura Fort | Hagikura Fort | 萩倉砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.08982, 138.079 |
| Hagiwarasuwa Castle | Hagiwarasuwa Castle | 萩原諏訪城 | Flatland | Ruins only | Edo Period | Gifu Prefecture | Viewer Contributed | 2022 | 35.87422, 137.21092 |
| Haguro Castle (Owari) | Haguro Castle (Owari) | 尾張羽黒城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 35.35331, 136.94966 |
| Haibara Castle | Haibara Castle | 埴原城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2015 | 2016 | 36.18868, 138.01528 |
| Haiyama Castle | Haiyama Castle | 灰山城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2022 | 2022 | 35.01656, 135.83445 |
| Hajikamigou Castle | Hajikamigou Castle | 薑郷城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.77128, 137.41191 |
| Hajoudo Castle | Hajoudo Castle | 半城土城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.98272, 137.02006 |
| Hajoudoko Castle | Hajoudoko Castle | 半城土古城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.98347, 137.02333 |
| Hakii Castle | Hakii Castle | 波木井城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.38714, 138.44231 |
| Hakii Yakata | Hakii Yakata | 波木井館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.36633, 138.42885 |
| Hakota Castle (Kozuke) | Hakota Castle (Kozuke) | 上野箱田城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2021 | 36.46244, 139.0409 |
| Hakoyama Castle (Takai) | Hakoyama Castle (Takai) | 高井箱山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.7506, 138.39062 |
| Hakoyanagi Castle | Hakoyanagi Castle | 箱柳城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.96762, 137.20553 |
| Hakusan Castle | Hakusan Castle | 白山城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | 2015 | 2016 | 35.70078, 138.42209 |
| Hakusan Castle (Harima) | Hakusan Castle (Harima) | 播磨白山城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | Viewer Contributed | 2017 | 34.89309, 134.65569 |
| Hamada Castle | Hamada Castle | 浜田城 | Mountaintop | No main keep but other buildings | Edo Period | Shimane Prefecture | 2014 | 2015 | 34.90291, 132.07333 |
| Hamada Castle (Ise) | Hamada Castle (Ise) | 伊勢浜田城 | Flatland | No main keep but other buildings | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.96487, 136.61678 |
| Hamagawa Castle | Hamagawa Castle | 浜川城 | Flatland | Ruins only | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2022 | 36.37199, 138.98086 |
| Hamamatsu Castle | Hamamatsu Castle | 浜松城 | Hilltop | Reconstructed main keep | Edo Period | Shizuoka Prefecture | 1999
2020 | 1999 | 34.71174, 137.72479 |
| Hanagoya Castle (Murakami Clan Fort Network) | Hanagoya Castle (Murakami Clan Fort Network) | 村上花古屋城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.42231, 138.2608 |
| Hanakuma Castle | Hanakuma Castle | 花隈城 | Flatland | Ruins only | Pre Edo Period | Hyogo Prefecture | Viewer Contributed | 2016 | 34.68816, 135.18291 |
| Hanamaki Castle | Hanamaki Castle | 花巻城 | Hilltop | No main keep but other buildings | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2018 | 39.39169, 141.12027 |
| Hanaoka Castle (Azumi) | Hanaoka Castle (Azumi) | 安曇花岡城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.44192, 137.88327 |
| Hanaoka Castle (Saku) | Hanaoka Castle (Saku) | 佐久花岡城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.14073, 138.48555 |
| Hanaoka Castle (Suwa) | Hanaoka Castle (Suwa) | 諏訪花岡城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2019 | 36.05316, 138.05079 |
| Hanasaki Castle (Tsuru) | Hanasaki Castle (Tsuru) | 都留花咲城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.60646, 138.92189 |
| Hanawa Castle | Hanawa Castle | 花輪城 | Hilltop | Ruins only | Pre Edo Period | Chiba Prefecture | 2017 | 2017 | 35.86815, 139.90356 |
| Hanazawa Yakata | Hanazawa Yakata | 花沢館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.30653, 137.93771 |
| Hanazono Castle | Hanazono Castle | 花園城 | Mountaintop | Ruins only | Pre Edo Period | Saitama Prefecture | 2018 | 2018 | 36.12252, 139.17249 |
| Hanazono Mitake Castle | Hanazono Mitake Castle | 花園御岳城 | Mountaintop | Ruins only | Pre Edo Period | Saitama Prefecture | 2018 | 2018 | 36.12616, 139.16828 |
| Hanehigashi Castle | Hanehigashi Castle | 羽根東城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92843, 137.15864 |
| Hanenishi Castle | Hanenishi Castle | 羽根西城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92822, 137.15481 |
| Haneo Castle | Haneo Castle | 羽根尾城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2022 | 36.55347, 138.60726 |
| Hannyaji Castle | Hannyaji Castle | 般若寺城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | 2024 | 2025 | 35.07651, 135.26469 |
| Harano Castle (Suwa) | Harano Castle (Suwa) | 原の城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.0348, 138.22298 |
| Haranomoto Castle | Haranomoto Castle | 原ノ元城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.73687, 137.98044 |
| Haruyamako Castle | Haruyamako Castle | 春山小城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.6098, 138.26671 |
| Haruyamaoh Castle | Haruyamaoh Castle | 春山大城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.6129, 138.2654 |
| Hasedo Castle | Hasedo Castle | 長谷堂城 | Mountaintop | Ruins only | Pre Edo Period | Yamagata Prefecture | 2017 | 2012 | 38.21267, 140.27243 |
| Hashira Castle (Mikawa) | Hashira Castle (Mikawa) | 三河柱城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92084, 137.15367 |
| Hatada Castle (Omi) | Hatada Castle (Omi) | 近江畑田城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.1525, 136.22682 |
| Hatakenaka Yakata | Hatakenaka Yakata | 畑中館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.05201, 137.97277 |
| Hatayama Castle | Hatayama Castle | 波多山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.18347, 137.83688 |
| Hatchou Castle (Mikawa) | Hatchou Castle (Mikawa) | 三河八丁城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.95713, 137.1517 |
| Hatsuzawa Castle | Hatsuzawa Castle | 初沢城 | Mountaintop | Ruins only | Pre Edo Period | Tokyo | Viewer Contributed | 2020 | 35.63562, 139.27888 |
| Hatta Yashiki | Hatta Yashiki | 八田屋敷 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.65409, 138.64115 |
| Hattori Castle (Koka) | Hattori Castle (Koka) | 服部城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2022 | 34.91886, 136.15982 |
| Hayakawa Yashiki (Kai) | Hayakawa Yashiki (Kai) | 甲斐早川屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.65638, 138.7033 |
| Hayaotoshi Castle | Hayaotoshi Castle | 早落城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.27771, 137.98523 |
| Hayashi Kohee Yashiki | Hayashi Kohee Yashiki | 林小兵衛屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.60354, 138.53985 |
| Hayashikojo Castle | Hayashikojo Castle | 林小城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2015 | 2015 | 36.21963, 138.00386 |
| Hayashiohjo Castle | Hayashiohjo Castle | 林大城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2015 | 2015 | 36.22526, 138.00911 |
| Hayashizore Castle | Hayashizore Castle | 林添城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.05066, 137.24151 |
| Hazu Castle (Ise) | Hazu Castle (Ise) | 伊勢羽津城 | Hilltop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.98809, 136.63192 |
| Hazu Jin'ya | Hazu Jin'ya | 幡豆陣屋 | Flatland | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.79291, 137.11956 |
| Hekirichi Jinya | Hekirichi Jinya | 戸切地陣屋 | Flatland | No main keep but other buildings | Edo Period | Hokkaido | Viewer Contributed | 2011 | 41.85428, 140.61895 |
| Hekitani Castle | Hekitani Castle | 日置谷城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2024 | 2024 | 35.36722, 135.4091 |
| Henmi Yashiki (Kai) | Henmi Yashiki (Kai) | 甲斐逸見屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.6297, 138.61418 |
| Hida Castle (Omi) | Hida Castle (Omi) | 近江肥田城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.20129, 136.20747 |
| Hieinoyama Fort | Hieinoyama Fort | 比叡ノ山砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.10135, 137.93503 |
| Higashi Goma Castle | Higashi Goma Castle | 東胡麻城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2024 | 2025 | 35.19109, 135.47806 |
| Higashi Kuramae Castle | Higashi Kuramae Castle | 東蔵前城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.99847, 137.17037 |
| Higashi Maruoka Castle (Koka) | Higashi Maruoka Castle (Koka) | 東丸岡城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2022 | 34.99978, 136.07013 |
| Higashi Sakabe Castle | Higashi Sakabe Castle | 東坂部城 | Hilltop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.99816, 136.59489 |
| Higashi Wada Castle | Higashi Wada Castle | 東和田城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.6578, 138.23229 |
| Higashijou Castle (Chikuma) | Higashijou Castle (Chikuma) | 筑摩東条城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.40481, 138.01912 |
| Higuchi Castle (Omi) | Higuchi Castle (Omi) | 近江樋口城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.32194, 136.32684 |
| Higuchiuchi Castle (Ina) | Higuchiuchi Castle (Ina) | 伊那樋口内城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.96222, 137.99465 |
| Hijika Castle | Hijika Castle | 日近城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.98732, 137.32188 |
| Hijiyama Castle (Iga) | Iga Hijiyama Castle | 伊賀比自山城 | Mountaintop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2022 | 34.75929, 136.09817 |
| Hikaru Castle | Hikaru Castle | 光城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.31851, 137.9423 |
| Hiki Castle | Hiki Castle | 日岐城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.4206, 137.93755 |
| Hikida Castle | Hikida Castle | 疋田城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.59989, 136.10013 |
| Hikidono Yashiki | Hikidono Yashiki | 日岐殿屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.42415, 137.94154 |
| Hikobe Yashiki | Hikobe Yashiki | 彦部屋敷 | Fortified Manor | No main keep but other buildings | Edo Period | Gunma Prefecture | 2020 | 2020 | 36.37355, 139.3483 |
| Hikone Castle | Hikone Castle | 彦根城 | Hilltop | Original main keep | Edo Period | Shiga Prefecture | 1996
2004
2019
2021
2022
2024 | 1999 | 35.27649, 136.25174 |
| Hikuma Castle | Hikuma Castle | 曳馬城 | Hilltop | Ruins only | Pre Edo Period | Shizuoka Prefecture | 2020 | 2020 | 34.71318, 137.72856 |
| Hime Castle (Chikuma) | Hime Castle (Chikuma) | 筑摩姫城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.08341, 137.96046 |
| Hime Castle (Hanishina) | Hime Castle (Hanishina) | 村上姫城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.46807, 138.17152 |
| Hime Castle (Mikawa) | Mikawa Hime Castle | 三河姫城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 34.9179, 137.09393 |
| Himega Castle (Mikawa) | Mikawa Himega Castle | 三河姫ヶ城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2022 | 34.93069, 137.22294 |
| Himeji Castle | Himeji Castle | 姫路城 | Hilltop | Original main keep | Edo Period | Hyogo Prefecture | 2009
1996
1997
1998
2004
2012
2018
2019
2022
2023
2024 | 1999 | 34.83806, 134.69348 |
| Himuro Yakata | Himuro Yakata | 氷室館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.24224, 137.90451 |
| Hina Yashiki | Hina Yashiki | 日名屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.96814, 137.14993 |
| Hinatabata Yakata | Hinatabata Yakata | 日向畑館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.45597, 138.34092 |
| Hino Castle | Hino Castle | 日野城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2023 | 35.0087, 136.26506 |
| Hinode Castle | Hinode Castle | 日ノ出城 | Hilltop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.73285, 138.4527 |
| Hinohara Castle | Hinohara Castle | 檜原城 | Mountaintop | Ruins only | Pre Edo Period | Tokyo | Viewer Contributed | 2023 | 35.72633, 139.14366 |
| Hirabayashi Castle (Minochi) | Hirabayashi Castle (Minochi) | 水内平林城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.65487, 138.21183 |
| Hirado Castle | Hirado Castle | 平戸城 | Hilltop | Reconstructed main keep | Edo Period | Nagasaki Prefecture | Viewer Contributed | 2011 | 33.36858, 129.55757 |
| Hirai Castle | Hirai Castle | 平井城 | Hilltop | Ruins only | Pre Edo Period | Gunma Prefecture | 2017 | 2017 | 36.21923, 139.02986 |
| Hirai Castle (Omi) | Hirai Castle (Omi) | 近江平居城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.1537, 136.22408 |
| Hirai Kanayama Castle | Hirai Kanayama Castle | 平井金山城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2017 | 2017 | 36.21409, 139.01758 |
| Hirai Yashiki (Kai) | Hirai Yashiki (Kai) | 甲斐平井屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.64929, 138.6564 |
| Hiraide Moated Settlement | Hiraide Moated Settlement | 平出環濠集落 | Flatland | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.10301, 137.94398 |
| Hiraiwa Castle (Mikawa) | Hiraiwa Castle (Mikawa) | 三河平岩城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.95261, 137.16922 |
| Hiraizumi Date | Hiraizumi Date | 平泉館 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2023 | 38.99369, 141.11966 |
| Hirakura Castle | Hirakura Castle | 平倉城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.8212, 137.91142 |
| Hirao Castle (Ise) | Hirao Castle (Ise) | 伊勢平尾城 | Hilltop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.99843, 136.55556 |
| Hirase Castle | Hirase Castle | 平瀬城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.28708, 137.94785 |
| Hirase Kitano Castle | Hirase Kitano Castle | 平瀬北ノ城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.29094, 137.95052 |
| Hirase Noroshidai | Hirase Noroshidai | 平瀬烽火台 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72129, 138.55379 |
| Hirase Yakata | Hirase Yakata | 平瀬館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.265, 137.94226 |
| Hirata Yashiki | Hirata Yashiki | 平田屋敷 | Fortified Manor | No main keep but other buildings | Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.85864, 138.3179 |
| Hiratsuka Castle | Hiratsuka Castle | 平塚城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2021 | 2021 | 35.74618, 139.74627 |
| Hirosaki Castle | Hirosaki Castle | 弘前城 | Hilltop | Original main keep | Edo Period | Aomori Prefecture | 1999
2010 | 1999 | 40.60783, 140.46533 |
| Hirose Castle (Hida) | Hida Hirose Castle | 飛騨広瀬城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2022 | 36.20029, 137.21974 |
| Hiroshima Castle | Hiroshima Castle | 広島城 | Flatland | Reconstructed main keep | Edo Period | Hiroshima Prefecture | 1996
2014
2018 | 1999 | 34.40272, 132.45888 |
| Hirota Castle | Hirota Castle | 広田城 | Flatland | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.59451, 138.17352 |
| Hisawa Castle | Hisawa Castle | 干沢城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.99004, 138.13628 |
| Hishakuyama Castle | Hishakuyama Castle | 柄杓山城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2020 | 2020 | 36.44526, 139.35864 |
| Hitomoshi Castle (Saku) | Hitomoshi Castle (Saku) | 佐久火燈城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.04013, 138.53994 |
| Hitomoshiyama Fort (Suwa) | Hitomoshiyama Fort (Suwa) | 諏訪火燈山砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.03534, 138.0654 |
| Hitoyoshi Castle | Hitoyoshi Castle | 人吉城 | Hilltop | No main keep but other buildings | Edo Period | Kumamoto Prefecture | Viewer Contributed | 2012 | 32.21108, 130.76649 |
| Hiyama Castle | Hiyama Castle | 檜山城 | Mountaintop | Ruins only | Pre Edo Period | Akita Prefecture | 2020 | 2021 | 40.16301, 140.12194 |
| Hizen Nagoya Castle | Hizen Nagoya Castle | 肥前名護屋城 | Hilltop | Ruins only | Pre Edo Period | Saga Prefecture | Viewer Contributed | 2011 | 33.53022, 129.86934 |
| Hobonishi Castle | Hobonishi Castle | 保々西城 | Hilltop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 35.06227, 136.54292 |
| Hodarakuji Castle | Hodarakuji Castle | 補陀楽寺城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2019 | 34.90374, 136.20942 |
| Hojo Clan Residence | Hojo Clan Residence | 円成寺北条氏邸 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2021 | 35.04716, 138.93685 |
| Hokkyu Castle | Hokkyu Castle | 保久城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.00792, 137.30084 |
| Hokkyu Jin'ya | Hokkyu Jin'ya | 保久陣屋 | Hilltop | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.00998, 137.30357 |
| Hongou Castle (Owari) | Hongou Castle (Owari) | 尾張本郷城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 35.13947, 137.04203 |
| Honjin'yama Castle (Mino) | Honjin'yama Castle (Mino) | 美濃本陣山城・美濃御嵩城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.42385, 137.13392 |
| Honjinzawabata Fort | Honjinzawabata Fort | 本神沢端砦 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.22998, 137.85091 |
| Honshouji Castle | Honshouji Castle | 本證寺城 | Flatland | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 34.90013, 137.08596 |
| Hora Castle (Mikawa) | Hora Castle (Mikawa) | 三河洞城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.95028, 137.19544 |
| Hora Yakata | Hora Yakata | 洞館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.08834, 137.96274 |
| Hori Castle (Minochi) | Hori Castle (Minochi) | 水内穂里城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.66545, 138.24021 |
| Horigane Yakata | Horigane Yakata | 堀金館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.29442, 137.87169 |
| Horigoe Palace | Horigoe Palace | 堀越御所 | Flatland | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2021 | 35.04909, 138.93922 |
| Horikawa Castle | Horikawa Castle | 堀川城 | Flatland | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.80307, 137.64603 |
| Horikoshi Castle | Horikoshi Castle | 堀越城 | Flatland | Ruins only | Pre Edo Period | Aomori Prefecture | 2020 | 2021 | 40.57262, 140.52156 |
| Horinouchi Castle (Kai) | Horinouchi Castle (Kai) | 甲斐堀之内城 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.61141, 138.55981 |
| Horinouchi Yakata (Azumi) | Horinouchi Yakata (Azumi) | 安曇堀之内館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.4356, 137.88097 |
| Horinouchi Yakata (Ina) | Horinouchi Yakata (Ina) | 伊那堀ノ内館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.97317, 138.01096 |
| Horinouchi Yashiki | Horinouchi Yashiki | 堀内屋敷 | Fortified Manor | No main keep but other buildings | Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.10765, 137.96837 |
| Horishi Yakata (Omi) | Horishi Yakata (Omi) | 近江堀氏館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2025 | 35.30584, 136.30937 |
| Horiuchi Castle (Mikawa) | Horiuchi Castle (Mikawa) | 三河堀内城 | Fortified Manor | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92573, 137.09026 |
| Horiuchi Shingu Castle | Horiuchi Shingu Castle | 堀内新宮城 | Fortified Manor | Ruins only | Pre Edo Period | Wakayama Prefecture | Viewer Contributed | 2025 | 33.72665, 135.98597 |
| Hoshigasaki Castle | Hoshigasaki Castle | 星ヶ崎城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2022 | 35.08284, 136.07703 |
| Hoshina Maenoyama Fort | Hoshina Maenoyama Fort | 保科前の山砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.59415, 138.25921 |
| Hoshina Yakata | Hoshina Yakata | 保科館 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.58981, 138.26552 |
| Hoshiyamako Castle | Hoshiyamako Castle | 星山古城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.75834, 138.331 |
| Hosogaya Yakata | Hosogaya Yakata | 細萱館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.31863, 137.90165 |
| Hosokawagonsui Castle | Hosokawagonsui Castle | 細川権水城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.03069, 137.16903 |
| Hosokawaonmaeda Castle | Hosokawaonmaeda Castle | 細川御前田城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.02187, 137.16578 |
| Hosokawashiroyama Castle | Hosokawashiroyama Castle | 細川城山城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.02962, 137.16883 |
| Hosshouji Castle (Mikawa) | Hosshouji Castle (Mikawa) | 三河法性寺城 | Fortified Manor | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92665, 137.14482 |
| Hotaka Yakata | Hotaka Yakata | 穂高館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.33598, 137.88358 |
| Hotta no Saku | Hotta no Saku | 払田柵 | Flatland | No main keep but other buildings | Pre Edo Period | Akita Prefecture | Viewer Contributed | 2012 | 39.46532, 140.54775 |
| Houjiin Doi | Houjiin Doi | 宝持院土居 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2022 | 35.3127, 138.94518 |
| Hourinji Yakata | Hourinji Yakata | 法林寺館 | Fortified Manor | Ruins only | Pre Edo Period | Tokyo | Viewer Contributed | 2023 | 35.71961, 139.32067 |
| Houshouji Fort | Houshouji Fort | 宝生寺砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.23727, 138.43885 |
| Houzouji Yakata | Houzouji Yakata | 法蔵寺館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.30248, 137.90462 |
| Hyakusaiji Castle | Hyakusaiji Castle | 百済寺城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2013 | 35.12689, 136.28883 |
| Hyogo Castle | Hyogo Castle | 兵庫城 | Flatland | No main keep but other buildings | Edo Period | Hyogo Prefecture | Viewer Contributed | 2020 | 34.66533, 135.17269 |
| Iba Castle | Iba Castle | 伊庭城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.17703, 136.14736 |
| Iba Palace | Iba Palace | 伊庭御殿 | Flatland | Ruins only | Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.17326, 136.15948 |
| Ibako Castle | Ibako Castle | 伊庭古城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.17444, 136.1525 |
| Ibaraki Castle | Ibaraki Castle | 茨木城 | Flatland | No main keep but other buildings | Pre Edo Period | Osaka | 2014 | 2014 | 34.82074, 135.57117 |
| Ibarayama Castle | Ibarayama Castle | 茨山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.65167, 137.86327 |
| Ibayama Castle | Ibayama Castle | 伊庭山城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.1692, 136.16332 |
| Ibi Castle | Ibi Castle | 揖斐城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.49535, 136.57267 |
| Ibuka Castle | Ibuka Castle | 伊深城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.28726, 137.97742 |
| Ichiba Castle (Ise) | Ichiba Castle (Ise) | 伊勢市場城 | Hilltop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 35.05699, 136.56073 |
| Ichibajin'yama Castle (Koka) | Kouka Ichibajin'yama Castle | 甲賀市場陣山城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 34.90242, 136.21033 |
| Ichigousan Castle | Ichigousan Castle | 一郷山城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2022 | 36.22011, 138.98939 |
| Ichijodani Castle | Ichijodani Castle | 一乗谷城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Fukui Prefecture | 2023 | 2013 | 36.00904, 136.30068 |
| Ichijodani Kojo Castle | Ichijodani Kojo Castle | 小城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | 2023 | 2023 | 36.00106, 136.30019 |
| Ichijodaniyama Castle | Ichijodaniyama Castle | 一乗谷山城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | 2023 | 2023 | 35.99499, 136.30929 |
| Ichijojiyama Castle | Ichijojiyama Castle | 一乗寺山城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2021 | 2022 | 35.05245, 135.81375 |
| Ichikawa Jin'ya | Ichikawa Jin'ya | 市川陣屋 | Flatland | Ruins only | Edo Period | Yamanashi Prefecture | Viewer Contributed | 2021 | 35.56188, 138.50102 |
| Ichinodaira Castle (Ina) | Ichinodaira Castle (Ina) | 伊那一ノ平城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.9953, 138.00784 |
| Ichinomiya Castle | Ichinomiya Castle | 一宮城 | Mountaintop | Ruins only | Pre Edo Period | Tokushima Prefecture | Viewer Contributed | 2012 | 34.0341, 134.46312 |
| Ida Castle (Mikawa) | Ida Castle (Mikawa) | 三河井田城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.97703, 137.16451 |
| Ide Yakata | Ide Yakata | 井出館 | Fortified Manor | No main keep but other buildings | Edo Period | Shizuoka Prefecture | Viewer Contributed | 2023 | 35.30146, 138.58804 |
| Iden Castle | Iden Castle | 位田城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2024 | 2025 | 35.31792, 135.24751 |
| Iden Miyanokoshi Castle | Iden Miyanokoshi Castle | 位田宮越城 | Fortified Manor | Ruins only | Pre Edo Period | Kyoto | 2024 | 2025 | 35.3143, 135.23958 |
| Iga Castle (Mikawa) | Iga Castle (Mikawa) | 三河伊賀城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.97341, 137.16465 |
| Iga Ueno Castle | Iga Ueno Castle | 伊賀上野城 | Hilltop | Reconstructed main keep | Edo Period | Mie Prefecture | 2012 | 2007 | 34.77013, 136.1271 |
| Igawa Castle | Igawa Castle | 井川城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.22232, 137.9645 |
| Ii Yakata | Ii Yakata | 井伊館 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.83456, 137.67357 |
| Iida Castle | Iida Castle | 飯田城 | Hilltop | No main keep but other buildings | Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.51212, 137.83183 |
| Iida Castle (Azumi) | Iida Castle (Azumi) | 安曇飯田城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.65844, 137.83322 |
| Iida Castle (Totomi) | Iida Castle (Totomi) | 遠江飯田城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.8048, 137.92153 |
| Iida Fort | Iida Fort | 飯田砦 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.26928, 137.92722 |
| Iida Yashiki | Iida Yashiki | 飯田屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.61826, 138.64433 |
| Iidako Castle (Totomi) | Iidako Castle (Totomi) | 遠江飯田古城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.80736, 137.92346 |
| Iijima Jin'ya | Iijima Jin'ya | 飯島陣屋 | Flatland | No main keep but other buildings | Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.68022, 137.92527 |
| Iimori Castle | Iimori Castle | 飯盛城 | Mountaintop | Ruins only | Pre Edo Period | Osaka | 2023 | 2023 | 34.72663, 135.65385 |
| Iimori Castle (Azumi) | Iimori Castle (Azumi) | 安曇飯森城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.66592, 137.84056 |
| Iimoriyama Castle (Asuke) | Iimoriyama Castle (Asuke) | 足助飯盛山城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.13265, 137.31595 |
| Iinawa Castle | Iinawa Castle | 飯縄城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.09051, 137.97304 |
| Iino Taira Castle | Iino Taira Castle | 飯野平城・大館城 | Hilltop | Ruins only | Pre Edo Period | Fukushima Prefecture | Viewer Contributed | 2018 | 37.05584, 140.87159 |
| Iinoya Castle | Iinoya Castle | 井伊谷城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.83716, 137.67051 |
| Iinuma Castle | Iinuma Castle | 飯沼城 | Flatland | Ruins only | Pre Edo Period | Ibaraki Prefecture | Viewer Contributed | 2018 | 36.28952, 140.38346 |
| Iiyama Castle | Iiyama Castle | 飯山城 | Hilltop | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.85636, 138.36648 |
| Iizuna Castle (Murakami Clan Fort Network) | Iizuna Castle (Murakami Clan Fort Network) | 村上飯綱城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.42417, 138.22813 |
| Iji Castle | Iji Castle | 伊治城 | Flatland | No main keep but other buildings | Pre Edo Period | Miyagi Prefecture | Viewer Contributed | 2023 | 38.76536, 141.03766 |
| Ijiri Yashiki | Ijiri Yashiki | 井尻屋敷 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.7065, 138.70662 |
| Ikarashi Yakata | Ikarashi Yakata | 五十嵐館 | Fortified Manor | Ruins only | Pre Edo Period | Niigata Prefecture | Viewer Contributed | 2023 | 37.57112, 139.04716 |
| Ikeda Castle | Ikeda Castle | 池田城 | Hilltop | Reconstructed main keep | Pre Edo Period | Osaka | 2013 | 2012 | 34.8268, 135.42811 |
| Ikeda Castle (Mino) | Ikeda Castle (Mino) | 美濃池田城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.32641, 137.10772 |
| Ikeda Yakata (Omi) | Ikeda Yakata (Omi) | 近江池田館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.10887, 136.07952 |
| Ikenoshiri Yakata | Ikenoshiri Yakata | 池尻館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.11825, 136.25656 |
| Ikkui Yashiki (Kai) | Ikkui Yashiki (Kai) | 甲斐飯喰屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.62226, 138.52291 |
| Ima Castle (Mino) | Ima Castle (Mino) | 美濃今城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.38082, 137.05115 |
| Imabari Castle | Imabari Castle | 今治城 | Flatland | Reconstructed main keep | Edo Period | Ehime Prefecture | 2001 | 2001 | 34.06305, 133.00667 |
| Imai Castle | Imai Castle | 今井城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2015 | 2015 | 35.81023, 139.31461 |
| Imai Fort | Imai Fort | 今井砦 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.13761, 137.88901 |
| Imai Jin'ya | Imai Jin'ya | 今井陣屋 | Flatland | Ruins only | Edo Period | Nagano Prefecture | Viewer Contributed | 2019 | 36.14638, 137.9046 |
| Imai Yashiki (Kai) | Imai Yashiki (Kai) | 甲斐今井屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.61693, 138.57991 |
| Imamura Castle (Omi) | Imamura Castle (Omi) | 近江今村城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.18799, 136.17607 |
| Imamura Castle (Yamashiro) | Imamura Castle (Yamashiro) | 山城今村城 | Fortified Manor | Ruins only | Pre Edo Period | Kyoto | Viewer Contributed | 2020 | 34.98246, 135.77061 |
| Imasu Castle (Mino) | Imasu Castle (Mino) | 美濃今須城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.35025, 136.43504 |
| Imori Castle (Suwa) | Imori Castle (Suwa) | 諏訪井森城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.0333, 138.12846 |
| Imoto Castle (Omi) | Imoto Castle (Omi) | 近江井本城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.10408, 136.24961 |
| Ina Castle | Ina Castle | 伊奈城 | Flatland | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 34.7941, 137.33442 |
| Ina Yashiki | Ina Yashiki | 伊奈氏屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Saitama Prefecture | 2022 | 2022 | 35.97469, 139.62911 |
| Inamura Castle (Ina) | Inamura Castle (Ina) | 伊那稲村城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.74415, 137.97524 |
| Inamurafuru Castle | Inamurafuru Castle | 稲村古城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.7416, 137.97433 |
| Inaniwa Castle | Inaniwa Castle | 稲庭城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Akita Prefecture | Viewer Contributed | 2016 | 39.09373, 140.58309 |
| Inariyama Castle (Saku) | Inariyama Castle (Saku) | 佐久稲荷山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.19253, 138.48253 |
| Inariyama Castle (Sarashina) | Inariyama Castle (Sarashina) | 更級稲荷山城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.53546, 138.10538 |
| Inatsuke Castle | Inatsuke Castle | 稲付城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2015 | 2015 | 35.77603, 139.71914 |
| Inawashiro Castle | Inawashiro Castle | 猪苗代城 | Hilltop | Ruins only | Edo Period | Fukushima Prefecture | 2011 | 2011 | 37.56207, 140.10388 |
| Injiki Castle | Injiki Castle | 印食城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2024 | 35.39419, 136.77876 |
| Innoshima Suigun Castle | Innoshima Suigun Castle | 因島水軍城 | Hilltop | Reconstructed main keep | Pre Edo Period | Hiroshima Prefecture | Viewer Contributed | 2013 | 34.32802, 133.16651 |
| Inoko Yakata | Inoko Yakata | 猪子館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.17675, 136.16359 |
| Inokuchi Castle | Inokuchi Castle | 井ノ口城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.12841, 137.28594 |
| Inokuchi Castle (Nukata) | Inokuchi Castle (Nukata) | 額田井口城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.98787, 137.1663 |
| Inokura Castle | Inokura Castle | 猪倉城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2023 | 2024 | 35.02846, 135.49046 |
| Inoue Castle | Inoue Castle | 井上城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.62802, 138.28123 |
| Inoue Yakata | Inoue Yakata | 井上館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.63254, 138.28303 |
| Inoue Yakata (Shiga) | Inoue Yakata (Shiga) | 井上氏館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2023 | 35.08508, 136.08498 |
| Inuinofuru Castle | Inuinofuru Castle | 乾ノ古城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.85927, 137.98634 |
| Inukai Castle | Inukai Castle | 犬甘城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2015 | 2016 | 36.24566, 137.95434 |
| Inukai Yakata | Inukai Yakata | 犬甘館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.2542, 137.94076 |
| Inuyama Castle | Inuyama Castle | 犬山城 | Hilltop | Original main keep | Edo Period | Aichi Prefecture | 1992
1996
2004 | 1999 | 35.38835, 136.93917 |
| Ioto Castle | Ioto Castle | 五百渡城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.11178, 138.0204 |
| Iouji Fort | Iouji Fort | 医王寺砦 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.93142, 137.55789 |
| Ioyama Castle | Ioyama Castle | 医王山城 | Mountaintop | Ruins only | Pre Edo Period | Okayama Prefecture | Viewer Contributed | 2013 | 35.12824, 134.06291 |
| Iroganeyama Fort | Iroganeyama Fort | 色金山砦 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.18598, 137.05452 |
| Isawa Castle | Isawa Castle | 胆沢城 | Flatland | Ruins only | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2018 | 39.17937, 141.13542 |
| Isawa Jin'ya | Isawa Jin'ya | 石和陣屋 | Flatland | No main keep but other buildings | Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.64868, 138.63712 |
| Isezaki Castle (Sanada) | Isezaki Castle (Sanada) | 真田伊勢崎城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.41152, 138.30212 |
| Ishibashi Castle | Ishibashi Castle | 石橋城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.96409, 137.41998 |
| Ishibayama Castle (Omi) | Ishibayama Castle | 石馬山城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.15912, 136.16189 |
| Ishida Castle (Mikawa) | Ishida Castle (Mikawa) | 三河石田城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.88925, 137.48815 |
| Ishida Jin'ya | Ishida Jin'ya | 石田陣屋 | Flatland | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.89181, 137.49242 |
| Ishigakiyama Ichiya Castle | Ishigakiyama Ichiya Castle | 石垣山一夜城 | Mountaintop | Ruins only | Pre Edo Period | Kanagawa Prefecture | 2009 | 2009 | 35.23545, 139.12777 |
| Ishigami Castle | Ishigami Castle | 石神城 | Hilltop | Ruins only | Pre Edo Period | Ibaraki Prefecture | Viewer Contributed | 2018 | 36.48262, 140.57814 |
| Ishihama Castle | Ishihama Castle | 石浜城 | Flatland | Ruins only | Pre Edo Period | Tokyo | Viewer Contributed
2020 | 2022 | 35.72849, 139.80822 |
| Ishikawa Jouzan Yashiki | Ishikawa Jouzan Yashiki | 石川丈山屋敷 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.92026, 137.04634 |
| Ishimakiyama Castle | Ishimakiyama Castle | 石巻山城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 34.78914, 137.45895 |
| Ishimura Castle | Ishimura Castle | 石村城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.71061, 138.25979 |
| Ishinomaki Castle | Ishinomaki Castle | 石巻城跡 | Hilltop | Ruins only | Pre Edo Period | Miyagi Prefecture | Viewer Contributed | 2023 | 38.42302, 141.30724 |
| Ishitono Yashiki | Ishitono Yashiki | 石殿屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.70813, 138.2608 |
| Ishiwata Yakata | Ishiwata Yakata | 石渡館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.66171, 138.23674 |
| Isobe Castle | Isobe Castle | 磯部城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2018 | 2018 | 36.29789, 138.86105 |
| Isobe Castle (Mikawa) | Isobe Castle (Mikawa) | 三河磯辺城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.99494, 137.16519 |
| Isshiki Castle (Chita) | Isshiki Castle (Chita) | 知多一色城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.73375, 136.87278 |
| Isshiki Castle (Omi) | Isshiki Castle | 一式城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.07413, 136.26011 |
| Isshiki Castle (Suruga) | Isshiki Castle (Suruga) | 駿河一色城 | Hilltop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2023 | 35.15616, 138.89369 |
| Isshindenjinai Moated Settlement | Isshindenjinai Moated Settlement | 一身田寺内環濠集落 | Flatland | No main keep but other buildings | Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.76195, 136.50371 |
| Itabashi Castle | Itabashi Castle | 板橋城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2021 | 2022 | 35.75526, 139.68664 |
| Itadafuru Yashiki (Mikawa) | Itadafuru Yashiki (Mikawa) | 三河板田古屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.97073, 137.23119 |
| Itagaki Kanenobu Yashiki | Itagaki Kanenobu Yashiki | 板垣兼信屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.6638, 138.59518 |
| Itagakiyama Noroshidai | Itagakiyama Noroshidai | 板垣山烽火台 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.6637, 138.60451 |
| Itami Castle | Itami Castle | 伊丹城 | Flatland | Ruins only | Pre Edo Period | Hyogo Prefecture | 2013 | 2013 | 34.78124, 135.42099 |
| Itazuke Moated Settlement | Itazuke Moated Settlement | 板付環濠集落 | Flatland | No main keep but other buildings | Pre Edo Period | Fukuoka Prefecture | Viewer Contributed | 2020 | 33.56542, 130.45291 |
| Itoi Jin'ya | Itoi Jin'ya | 糸井陣屋 | Flatland | No main keep but other buildings | Edo Period | Hyogo Prefecture | Viewer Contributed | 2021 | 35.3632, 134.84348 |
| Itoigawa Jinya | Itoigawa Jinya | 糸魚川陣屋 | Hilltop | Ruins only | Edo Period | Niigata Prefecture | Viewer Contributed | 2021 | 37.04389, 137.85351 |
| Itokazu Castle | Itokazu Castle | 糸数城 | Hilltop | Ruins only | Pre Edo Period | Okinawa Prefecture | | 2022 | 26.15138, 127.76234 |
| Itou Genba Yashiki | Itou Genba Yashiki | 伊藤玄蕃屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.75275, 138.42547 |
| Itousakaue Fort | Itousakaue Fort | 伊藤坂上砦 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.22565, 137.86197 |
| Iuchi Castle (Mikawa) | Iuchi Castle (Mikawa) | 三河井内城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92102, 137.14736 |
| Iwabitsu Castle | Iwabitsu Castle | 岩櫃城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2016 | 2016 | 36.5594, 138.80447 |
| Iwabuchi Castle (Aida) | Iwabuchi Castle (Aida) | 会田岩渕城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.34697, 138.00433 |
| Iwade Danjou Kyokan | Iwade Danjou Kyokan | 岩手弾正居館 | Fortified Manor | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2020 | 35.3842, 136.50996 |
| Iwade Yashiki (Kai) | Iwade Yashiki (Kai) | 甲斐岩手屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.712, 138.69796 |
| Iwadono Castle | Iwadono Castle | 岩殿城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Yamanashi Prefecture | 2019 | 2011 | 35.62159, 138.9499 |
| Iwahara Castle (Azumi) | Iwahara Castle (Azumi) | 安曇岩原城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.30934, 137.83109 |
| Iwahori Castle (Mikawa) | Iwahori Castle (Mikawa) | 三河岩堀城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.87235, 137.16717 |
| Iwaki Taira Castle | Iwaki Taira Castle | 磐城平城 | Hilltop | No main keep but other buildings | Edo Period | Fukushima Prefecture | Viewer Contributed | 2015 | 37.06017, 140.88965 |
| Iwakiri Castle | Iwakiri Castle | 岩切城 | Mountaintop | Ruins only | Pre Edo Period | Miyagi Prefecture | 2020 | 2021 | 38.31342, 140.94 |
| Iwakubo Yakata | Iwakubo Yakata | 岩窪館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.68082, 138.58328 |
| Iwakuni Castle | Iwakuni Castle | 岩国城 | Mountaintop | Reconstructed main keep | Edo Period | Yamaguchi Prefecture | 1996
1998
2019 | 1999 | 34.1752, 132.17422 |
| Iwakura Castle | Iwakura Castle | 岩倉城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.06556, 136.0604 |
| Iwakura Castle (Mikawa) | Iwakura Castle (Mikawa) | 三河岩倉城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.04942, 137.19077 |
| Iwakura Castle (Owari) | Iwakura Castle (Owari) | 尾張岩倉城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.27493, 136.87816 |
| Iwakura Yakata (Mikawa) | Iwakura Yakata (Mikawa) | 三河岩倉館 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.04843, 137.1905 |
| Iwakuratouge Castle (Mikawa) | Iwakuratouge Castle (Mikawa) | 岩倉峠城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.04774, 137.18903 |
| Iwamura Castle | Iwamura Castle | 岩村城 | Mountaintop | No main keep but other buildings | Edo Period | Gifu Prefecture | 2014 | 2007 | 35.35993, 137.45102 |
| Iwaoka Yakata | Iwaoka Yakata | 岩岡館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.22844, 137.89367 |
| Iwasaki Castle | Iwasaki Castle | 岩崎城 | Hilltop | Reconstructed main keep | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2008 | 35.14539, 137.04212 |
| Iwasaki Castle (Hanishina) | Iwasaki Castle (Hanishina) | 村上岩崎城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.47409, 138.16616 |
| Iwasaki Castle (Mutsu) | Iwasaki Castle (Mutsu) | 陸奥岩崎城 | Hilltop | Ruins only | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2018 | 39.28075, 141.04511 |
| Iwasaki Yakata | Iwasaki Yakata | 岩崎館 | Hilltop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.65331, 138.72219 |
| Iwasakiyama Fort | Iwasakiyama Fort | 岩崎山砦 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2024 | 2025 | 35.53054, 136.20442 |
| Iwaseyama Castle | Iwaseyama Castle | 岩瀬山城 | Mountaintop | Ruins only | Pre Edo Period | Fukushima Prefecture | Viewer Contributed | 2017 | 37.29223, 140.38058 |
| Iwato Castle (Mikawa) | Iwato Castle (Mikawa) | 三河岩戸城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.96549, 137.24862 |
| Iwatsuki Castle | Iwatsuki Castle | 岩槻城 | Flatland | No main keep but other buildings | Edo Period | Saitama Prefecture | 2009 | 2009 | 35.95107, 139.71153 |
| Iwaya Castle | Iwaya Castle | 岩屋城 | Mountaintop | Ruins only | Pre Edo Period | Fukuoka Prefecture | Viewer Contributed | 2013 | 33.52594, 130.52029 |
| Iwazu Castle | Iwazu Castle | 岩津城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.00484, 137.17441 |
| Iwazu Daizen Castle | Iwazu Daizen Castle | 岩津大膳城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.0045, 137.17042 |
| Iwazu Daizennishi Castle | Iwazu Daizennishi Castle | 岩津大膳西城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.0053, 137.16886 |
| Iwazu Dannoue Castle | Iwazu Dannoue Castle | 岩津壇ノ上城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.00448, 137.16877 |
| Iwazu Ino Castle | Iwazu Ino Castle | 岩津井ノ城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.00662, 137.17484 |
| Iwazu Kibira Castle | Iwazu Kibira Castle | 岩津木平城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.00287, 137.16893 |
| Iwazu Myoshinji Castle | Iwazu Myoshinji Castle | 岩津妙心寺城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.00384, 137.16952 |
| Iwazu Naruse Castle | Iwazu Naruse Castle | 岩津成瀬城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.00604, 137.16815 |
| Iwazushin Castle | Iwazushin Castle | 岩津新城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.00745, 137.17061 |
| Iyo Matsuyama Castle | Iyo Matsuyama Castle | 伊予松山城 | Hilltop | Original main keep | Edo Period | Ehime Prefecture | 2001
2016 | 2001 | 33.84526, 132.76575 |
| Izaki Castle | Izaki Castle | 猪崎城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2021 | 2022 | 35.30793, 135.13296 |
| Izu Nagahama Castle | Izu Nagahama Castle | 伊豆長浜城 | Hilltop | No main keep but other buildings | Pre Edo Period | Shizuoka Prefecture | 2016 | 2016 | 35.01784, 138.88833 |
| Izuki Jin'ya | Izuki Jin'ya | 伊豆木陣屋 | Hilltop | No main keep but other buildings | Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.44618, 137.7951 |
| Izumi Jin'ya | Izumi Jin'ya | 泉陣屋 | Flatland | No main keep but other buildings | Edo Period | Fukushima Prefecture | Viewer Contributed | 2016 | 36.95154, 140.85436 |
| Izumigashira Castle | Izumigashira Castle | 泉頭城 | Flatland | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2021 | 35.10704, 138.90178 |
| Izushi Castle | Izushi Castle | 出石城 | Hilltop | No main keep but other buildings | Edo Period | Hyogo Prefecture | 2013 | 2004 | 35.46025, 134.87445 |
| Jikki Yashiki | Jikki Yashiki | 十騎屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.80384, 138.42612 |
| Jikouin Fort | Jikouin Fort | 慈光院砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.0934, 137.97257 |
| Jikouin Yakata | Jikouin Yakata | 慈光院館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.09312, 137.97441 |
| Jinbagahara Castle | Jinbagahara Castle | 陣場ヶ原城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.01074, 137.98952 |
| Jindaiji Castle | Jindaiji Castle | 深大寺城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2015 | 2012 | 35.66543, 139.55086 |
| Jinguuji Yakata | Jinguuji Yakata | 神宮寺館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.26629, 137.989 |
| Jinnoya Castle (Mikawa) | Jinnoya Castle (Mikawa) | 三河陣ノ屋城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.91355, 137.28001 |
| Jionji Yakata | Jionji Yakata | 慈恩寺館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.13779, 136.1285 |
| Jissouji Yakata | Jissouji Yakata | 実相寺館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.78112, 138.36749 |
| Jizen Castle (Koka) | Jizen Castle (Koka) | 寺前城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2022 | 34.91542, 136.15869 |
| Jofukuji Castle | Jofukuji Castle | 浄福寺城 | Mountaintop | Ruins only | Pre Edo Period | Tokyo | 2016 | 2016 | 35.67102, 139.24663 |
| Jou Ian Yashiki | Jou Ian Yashiki | 城伊庵屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.68602, 138.69021 |
| Jouguuji Castle | Jouguuji Castle | 上宮寺城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.94207, 137.12407 |
| Jouhikage Fort | Jouhikage Fort | 城日影砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.19614, 137.81748 |
| Joujou Castle | Joujou Castle | 上条城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 35.23973, 136.9841 |
| Joukouin Yakata | Joukouin Yakata | 城光院館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.26764, 138.3622 |
| Joumineyama Castle | Joumineyama Castle | 城峰山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.48678, 137.91753 |
| Joumura Castle (Ina) | Joumura Castle (Ina) | 伊那城村城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.75144, 137.97973 |
| Joumurafuru Castle | Joumurafuru Castle | 城村古城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.74956, 137.98125 |
| Jounoue Fort | Jounoue Fort | 城ノ上砦 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.22913, 137.86425 |
| Jukkumi Yashiki | Jukkumi Yashiki | 十組屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72162, 138.71451 |
| Junhanshi Yashiki | Junhashi Yashiki | 准藩士屋敷 | Fortified Manor | Ruins only | Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.61074, 135.96219 |
| Jurakudai | Jurakudai | 聚楽第 | Flatland | No main keep but other buildings | Pre Edo Period | Kyoto | Viewer Contributed | 2020 | 35.02488, 135.74589 |
| Juuouzan Fort | Juuouzan Fort | 十王山砦 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2022 | 36.26805, 138.89711 |
| Kabuto Castle | Kabuto Castle | 鹿伏兎城 | Mountaintop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.8441, 136.33734 |
| Kadone Castle (Omi) | Kadone Castle (Omi) | 近江門根城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.32124, 136.32416 |
| Kaesa Castle | Kaesa Castle | 替佐城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.7713, 138.31488 |
| Kagami Yakata | Kagami Yakata | 加賀美館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.60276, 138.48501 |
| Kagamiyama Fort | Kagamiyama Fort | 鏡山砦 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.94697, 137.24182 |
| Kaganoi Castle | Kaganoi Castle | 加賀野井城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2024 | 35.29279, 136.7164 |
| Kageyama Castle (Mikawa) | Kageyama Castle (Mikawa) | 三河影山城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.94812, 137.15221 |
| Kagikakemonomi Fort | Kagikakemonomi Fort | 鍵掛物見砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.18103, 137.78572 |
| Kagohana Fort | Kagohana Fort | 籠鼻砦 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.99425, 138.37215 |
| Kagoshima Castle | Kagoshima Castle | 鹿児島城 | Flatland | No main keep but other buildings | Edo Period | Kagoshima Prefecture | Viewer Contributed | 2013 | 31.59825, 130.55441 |
| Kaguraoka Castle | Kaguraoka Castle | 神楽岡城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2024 | 2024 | 35.02268, 135.78515 |
| Kaibai Castle | Kaibai Castle | 貝梅城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.34706, 137.88222 |
| Kaibara Jinya | Kaibara Jinya | 柏原陣屋 | Flatland | No main keep but other buildings | Edo Period | Hyogo Prefecture | Viewer Contributed | 2020 | 35.12886, 135.08218 |
| Kaiden Castle | Kaiden Castle | 開田城 | Fortified Manor | Ruins only | Pre Edo Period | Kyoto | 2014 | 2014 | 34.92619, 135.69153 |
| Kaize Castle (Saku) | Kaize Castle (Saku) | 佐久海瀬城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.15362, 138.49009 |
| Kajiya Castle | Kajiya Castle | 鍛冶屋城 | Hilltop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.97873, 137.27574 |
| Kake Castle (Hazu) | Kake Castle (Hazu) | 幡豆欠城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.79191, 137.11608 |
| Kake Castle (Nukata) | Kake Castle (Nukata) | 額田欠城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.95276, 137.19035 |
| Kakegawa Castle | Kakegawa Castle | 掛川城 | Hilltop | Reconstructed main keep | Edo Period | Shizuoka Prefecture | 1999
2009 | 1999 | 34.77546, 138.01486 |
| Kakegawako Castle | Kakegawako Castle | 掛川古城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2022 | 34.77784, 138.01732 |
| Kakiage Castle (Chikuma) | Kakiage Castle (Chikuma) | 筑摩掻揚城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.31061, 138.02824 |
| Kakimi Castle (Omi) | Kakimi Castle (Omi) | 近江垣見城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.18284, 136.16616 |
| Kakinohana Castle | Kakinohana Castle | 垣花城 | Hilltop | Ruins only | Pre Edo Period | Okinawa Prefecture | Viewer Contributed | 2023 | 26.14812, 127.79276 |
| Kakizaki Castle | Kakizaki Castle | 柿崎城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Niigata Prefecture | Viewer Contributed | 2023 | 37.2715, 138.38745 |
| Kakuhari Yashiki | Kakuhari Yashiki | 角張屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.62993, 138.28732 |
| Kakunodate Castle | Kakunodate Castle | 角館城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Akita Prefecture | 1998
2004
2018 | 1999 | 39.60653, 140.56273 |
| Kakutsugawa Castle | Kakutsugawa Castle | 鹿勝川城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.90713, 137.3084 |
| Kamaenohaka Yakata | Kamaenohaka Yakata | 構え之墓館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.30057, 137.90729 |
| Kamagari Castle (Omi) | Kamagari Castle (Omi) | 近江河曲城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.1704, 136.18601 |
| Kamagatake Castle | Kamagatake Castle | 鎌ヶ嶽城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.74004, 138.38879 |
| Kamaha Castle | Kamaha Castle | 鎌刃城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2023 | 35.29703, 136.31539 |
| Kamaian Yakata | Kamaian Yakata | 釜井庵館 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.10751, 137.91149 |
| Kamakata Jin'ya | Kamakata Jin'ya | 蒲形陣屋 | Flatland | No main keep but other buildings | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.82926, 137.22919 |
| Kameda Castle | Kameda Castle | 亀田城 | Flatland | Reconstructed main keep | Edo Period | Akita Prefecture | Viewer Contributed | 2016 | 39.49903, 140.08709 |
| Kamegasaki Castle | Kamegasaki Castle | 亀ヶ崎城 | Flatland | No main keep but other buildings | Edo Period | Yamagata Prefecture | Viewer Contributed | 2023 | 38.9096, 139.84099 |
| Kamei Castle | Kamei Castle | 亀居城 | Hilltop | Ruins only | Edo Period | Hiroshima Prefecture | 2018 | 2012 | 34.24059, 132.21646 |
| Kamei Castle (Murakami Clan Fort Network) | Kamei Castle (Murakami Clan Fort Network) | 村上亀井城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.42987, 138.22616 |
| Kameyama Battery | Kameyama Battery | 亀山台場 | Hilltop | Ruins only | Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 33.95711, 130.94472 |
| Kameyama Castle | Kameyama Castle | 亀山城 | Hilltop | No main keep but other buildings | Edo Period | Mie Prefecture | Viewer Contributed | 2008 | 34.85617, 136.45056 |
| Kameyama Castle (Azumi) | Kameyama Castle (Azumi) | 安曇亀山城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2019 | 36.2173, 137.84054 |
| Kameyama Castle (Kii) | Kameyama Castle (Kii) | 亀山城 | Mountaintop | Ruins only | Pre Edo Period | Wakayama Prefecture | 2023 | 2023 | 33.91094, 135.15475 |
| Kameyama Castle (Mikawa) | Kameyama Castle (Mikawa) | 三河亀山城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.96373, 137.4233 |
| Kami Castle (Suwa) | Kami Castle (Suwa) | 諏訪上城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.09668, 138.07731 |
| Kamigare Castle | Kamigare Castle | 上狩宇城 | Fortified Manor | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.47538, 136.49028 |
| Kamigatou Yashiki | Kamigatou Yashiki | 上河東屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.61877, 138.52857 |
| Kamigishimoto Castle (Omi) | Kamigishimoto Castle (Omi) | 近江上岸本城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.11426, 136.23362 |
| Kamihiraideko Castle (Ina) | Kamihiraideko Castle (Ina) | 伊那上平井出小城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 35.99378, 138.00695 |
| Kamiiida Jin'ya | Kamiiida Jin'ya | 上飯田陣屋 | Flatland | Ruins only | Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.66274, 138.56094 |
| Kamijima Castle (Ina) | Kamijima Castle (Ina) | 小出上島城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.82676, 137.94618 |
| Kamikurabara Fort | Kamikurabara Fort | 上蔵原塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.82617, 138.41748 |
| Kamimakifuru Castle | Kamimakifuru Castle | 上牧古城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.85348, 137.98182 |
| Kaminagahara Castle | Kaminagahara Castle | 上永原城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.08395, 136.04039 |
| Kaminogou Castle | Kaminogou Castle | 上ノ郷城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2022 | 34.84222, 137.22516 |
| Kaminoyama Castle | Kaminoyama Castle | 上山城 | Hilltop | Reconstructed main keep | Edo Period | Yamagata Prefecture | 1997
2017 | 1999 | 38.15786, 140.27592 |
| Kamioka Castle | Kamioka Castle | 神岡城 | Hilltop | Reconstructed main keep | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2011 | 36.32991, 137.30232 |
| Kamitohno Castle | Kamitohno Castle | 上遠野城 | Mountaintop | Ruins only | Pre Edo Period | Fukushima Prefecture | Viewer Contributed | 2016 | 37.01253, 140.75086 |
| Kamiwada Castle | Kamiwada Castle | 上和田城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.93091, 137.15279 |
| Kamo Castle (Bitchu) | Kamo Castle (Bitchu) | 備中鴨庄城 | Flatland | Ruins only | Pre Edo Period | Okayama Prefecture | Viewer Contributed | 2022 | 34.67398, 133.82931 |
| Kamogatake Castle | Kamogatake Castle | 鴨ヶ嶽城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.74313, 138.38794 |
| Kamomegasaki Battery (Obama Domain) | Obama Domain Kamomegasaki Battery | 小浜藩鴎ヶ崎台場 | Mountaintop | Ruins only | Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.66448, 136.07251 |
| Kan'onsaka Castle (Hanishina) | Kan'onsaka Castle (Hanishina) | 村上観音坂城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.44349, 138.19139 |
| Kanaiyama Castle | Kanaiyama Castle | 金井山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2016 | 2017 | 36.58379, 138.20608 |
| Kanao Yogaisan Castle | Kanao Yogaisan Castle | 金尾要害山城 | Mountaintop | Ruins only | Pre Edo Period | Saitama Prefecture | 2018 | 2018 | 36.13065, 139.15071 |
| Kanasashi Yakata | Kanasashi Yakata | 金刺館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.07275, 138.08868 |
| Kanayama Castle | Kanayama Castle | 金山城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | 2007
2013 | 2007 | 36.31741, 139.37768 |
| Kanayama Castle (Echigo) | Kanayama Castle (Echigo) | 越後金山城 | Mountaintop | Ruins only | Pre Edo Period | Niigata Prefecture | Viewer Contributed | 2021 | 37.04764, 137.90817 |
| Kanazawa Castle | Kanazawa Castle | 金沢城 | Hilltop | No main keep but other buildings | Edo Period | Ishikawa Prefecture | 2006
2016
2020 | 2006 | 36.56549, 136.65928 |
| Kanbara Castle | Kanbara Castle | 鎌原城 | Mountaintop | Ruins only | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2022 | 36.52365, 138.54511 |
| Kanbayashi Castle | Kanbayashi Castle | 上林城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2024 | 2024 | 35.35976, 135.40652 |
| Kanbe Castle | Kanbe Castle | 神戸城 | Flatland | No main keep but other buildings | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2017 | 34.87881, 136.57734 |
| Kanegasaki Battery (Obama Domain) | Obama Domain Kanegasaki Battery | 小浜藩金ヶ崎台場 | Flatland | Ruins only | Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.66244, 136.07324 |
| Kanegasaki Castle | Kanegasaki Castle | 金ヶ崎城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | Viewer Contributed | 2015 | 35.66602, 136.07407 |
| Kanegasaki Castle (Iwate) | Kanegasaki Castle | 金ヶ崎城 | Flatland | Ruins only | Edo Period | Iwate Prefecture | 2018 | 2018 | 39.19756, 141.12266 |
| Kaneko Castle (Suwa) | Kaneko Castle (Suwa) | 諏訪金子城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.01117, 138.11373 |
| Kaneko Yashiki (Minochi) | Kaneko Yashiki (Minochi) | 水内金子屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.63422, 138.20458 |
| Kanemaru Yakata | Kanemaru Yakata | 金丸館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.65312, 138.48863 |
| Kaneyama Castle (Mino) | Kaneyama Castle (Mino) | 美濃金山城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.45656, 137.09725 |
| Kaneyama Castle (Mutsu) | Kaneyama Castle (Mutsu) | 陸奥金山城 | Mountaintop | Ruins only | Pre Edo Period | Miyagi Prefecture | Viewer Contributed | 2017 | 37.89855, 140.8073 |
| Kanmuriyama Castle (Bitchu) | Kanmuriyama Castle (Bitchu) | 備中冠山城 | Mountaintop | Ruins only | Pre Edo Period | Okayama Prefecture | Viewer Contributed | 2022 | 34.71946, 133.80532 |
| Kannonji Castle | Kannonji Castle | 観音寺城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2011 | 2007 | 35.14544, 136.16293 |
| Kannosan Castle | Kannosan Castle | 神尾山城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2023 | 2024 | 35.03905, 135.46978 |
| Kano Castle | Kano Castle | 加納城 | Flatland | Ruins only | Edo Period | Gifu Prefecture | 2019 | 2020 | 35.3996, 136.76034 |
| Kanzeyamachi Battery (Obama Domain) | Obama Domain Kanzeyamachi Battery | 小浜藩観世屋町台場 | Flatland | Ruins only | Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.65668, 136.06889 |
| Kanzou Yashiki | Kanzou Yashiki | 甘草屋敷 | Fortified Manor | No main keep but other buildings | Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.70646, 138.7349 |
| Karakai Castle | Karakai Castle | 辛垣城 | Mountaintop | Ruins only | Pre Edo Period | Tokyo | 2017 | 2017 | 35.8119, 139.22042 |
| Karasaki Castle | Karasaki Castle | 唐崎城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.54566, 138.15414 |
| Karasawayama Castle | Karasawayama Castle | 唐沢山城 | Mountaintop | Ruins only | Pre Edo Period | Tochigi Prefecture | 2007
2018 | 2007 | 36.3538, 139.60078 |
| Karasuyama Castle | Karasuyama Castle | 烏山城 | Mountaintop | Ruins only | Edo Period | Tochigi Prefecture | 2015 | 2015 | 36.66389, 140.1475 |
| Karatoriya Castle | Karatoriya Castle | 唐鳥屋城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.37188, 138.00693 |
| Karatsu Castle | Karatsu Castle | 唐津城 | Hilltop | Reconstructed main keep | Edo Period | Saga Prefecture | Viewer Contributed | 2006 | 33.45354, 129.97819 |
| Karidako Castle | Karidako Castle | 雁田小城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.69974, 138.33505 |
| Karidaoh Castle | Karidaoh Castle | 雁田大城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.6986, 138.33827 |
| Kariya Castle | Kariya Castle | 刈谷城 | Hilltop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2020 | 34.98871, 136.98425 |
| Kariyahara Castle | Kariyahara Castle | 刈谷原城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.31627, 137.98251 |
| Kasama Castle | Kasama Castle | 笠間城 | Mountaintop | No main keep but other buildings | Edo Period | Ibaraki Prefecture | 2011 | 2011 | 36.38257, 140.26734 |
| Kasane Castle | Kasane Castle | 重ね城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2019 | 36.10968, 137.88262 |
| Kasashima Castle | Kasashima Castle | 笠島城 | Hilltop | Ruins only | Pre Edo Period | Kagawa Prefecture | Viewer Contributed | 2014 | 34.39439, 133.78783 |
| Kaseyama Castle | Kaseyama Castle | 鹿背山城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2023 | 2012 | 34.74638, 135.84352 |
| Kashima Castle (Hizen) | Kashima Castle (Hizen) | 肥前鹿島城 | Flatland | No main keep but other buildings | Edo Period | Saga Prefecture | Viewer Contributed | 2020 | 33.10399, 130.09348 |
| Kashiwabara Castle (Omi) | Kashiwabara Castle (Omi) | 近江柏原城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.34564, 136.38848 |
| Kashiwabara Palace | Kashiwabara Palace | 柏原御殿 | Flatland | Ruins only | Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.34047, 136.39606 |
| Kashiwara Castle | Kashiwara Castle | 柏原城 | Hilltop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2016 | 34.59456, 136.08394 |
| Kashiwayama Castle (Murakami Clan Fort Network) | Kashiwayama Castle (Murakami Clan Fort Network) | 村上柏山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.42551, 138.27998 |
| Kasuga Castle (Ina) | Kasuga Castle (Ina) | 伊那春日城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.8371, 137.94847 |
| Kasugayama Castle | Kasugayama Castle | 春日山城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Niigata Prefecture | 2011 | 2011 | 37.14657, 138.20552 |
| Kasumi Castle | Kasumi Castle | 霞城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2016 | 2016 | 36.59484, 138.22168 |
| Kasumiga Castle (Suwa) | Kasumiga Castle (Suwa) | 諏訪霞ヶ城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.07392, 138.09026 |
| Katahara Castle (Mikawa) | Katahara Castle (Mikawa) | 三河形原城 | Hilltop | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.79043, 137.18596 |
| Katakari Castle (Tanba) | Katakari Castle (Tanba) | 丹波鹿集城 | Fortified Manor | Ruins only | Pre Edo Period | Hyogo Prefecture | Viewer Contributed | 2021 | 35.21555, 135.14182 |
| Katakura Castle | Katakura Castle | 片倉城 | Hilltop | Ruins only | Pre Edo Period | Tokyo | 2015 | 2015 | 35.63996, 139.3373 |
| Katsumata Castle | Katsumata Castle | 勝間田城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.7784, 138.15759 |
| Katsumoto Castle | Katsumoto Castle | 勝本城 | Hilltop | Ruins only | Pre Edo Period | Nagasaki Prefecture | Viewer Contributed | 2020 | 33.84938, 129.69113 |
| Katsunuma Castle | Katsunuma Castle | 勝沼城 | Mountaintop | Ruins only | Pre Edo Period | Tokyo | 2015 | 2015 | 35.79542, 139.2744 |
| Katsunumashi Yakata | Katsunumashi Yakata | 勝沼氏館 | Fortified Manor | Ruins only | Edo Period | Yamanashi Prefecture | 2017 | 2017 | 35.65989, 138.73174 |
| Katsurao Castle (Hanishina) | Katsurao Castle (Hanishina) | 村上葛尾城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.47382, 138.17299 |
| Katsurayama Castle | Katsurayama Castle | 葛山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.67087, 138.16673 |
| Katsuren Castle | Katsuren Castle | 勝連城 | Mountaintop | Ruins only | Pre Edo Period | Okinawa Prefecture | Viewer Contributed | 2008 | 26.33049, 127.87887 |
| Katsushima Castle (Omi) | Katsushima Castle (Omi) | 近江勝島城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2020 | 35.08975, 136.28307 |
| Katsuyama Castle (Echigo) | Katsuyama Castle (Echigo) | 越後勝山城 | Mountaintop | Ruins only | Pre Edo Period | Niigata Prefecture | Viewer Contributed | 2021 | 37.01545, 137.77116 |
| Katsuyama Castle (Nagato) | Katsuyama Castle (Nagato) | 長門且山城 | Mountaintop | Ruins only | Pre Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 34.03235, 130.97061 |
| Katsuyama Castle (Tsuru) | Katsuyama Castle (Tsuru) | 勝山城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | 2019 | 2020 | 35.55434, 138.90411 |
| Katsuyama Castle (Yatsushiro) | Katsuyama Castle (Yatsushiro) | 八代勝山城 | Hilltop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.60243, 138.59618 |
| Katsuyama Palace | Katsuyama Palace | 勝山御殿 | Flatland | No main keep but other buildings | Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 34.02112, 130.9724 |
| Kattori Castle (Chikuma) | Kattori Castle (Chikuma) | 筑摩川鳥城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.05971, 137.95869 |
| Kawagoe Castle | Kawagoe Castle | 川越城 | Flatland | No main keep but other buildings | Edo Period | Saitama Prefecture | 2006
2012 | 2006 | 35.92451, 139.49143 |
| Kawahara Castle | Kawahara Castle | 河原城 | Hilltop | Reconstructed main keep | Pre Edo Period | Tottori Prefecture | Viewer Contributed | 2017 | 35.40382, 134.19949 |
| Kawajiri Castle | Kawajiri Castle | 川尻城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.98152, 137.42912 |
| Kawamura Castle | Kawamura Castle | 河村城 | Mountaintop | Ruins only | Pre Edo Period | Kanagawa Prefecture | 2014 | 2014 | 35.35578, 139.07715 |
| Kawamura Yakata | Kawamura Yakata | 河村館 | Fortified Manor | Ruins only | Pre Edo Period | Kanagawa Prefecture | Viewer Contributed | 2022 | 35.35443, 139.08888 |
| Kawanami Castle (Omi) | Kawanami Castle (Omi) | 近江川南城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.20165, 136.16483 |
| Kawanoe Castle | Kawanoe Castle | 川之江城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Ehime Prefecture | Viewer Contributed | 2011 | 34.013, 133.56756 |
| Kawasaki Battery (Obama Domain) | Obama Domain Kawasaki Battery | 小浜藩川崎台場 | Flatland | Ruins only | Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.5006, 135.74131 |
| Kawasaki Shoujirou Yakata | Kawasaki Shoujirou Yakata | 川崎庄司郎館 | Fortified Manor | Ruins only | Pre Edo Period | Tokyo | Viewer Contributed | 2022 | 35.6571, 139.70508 |
| Kawasaki no Saku | Kawasaki no Saku | 河崎柵 | Flatland | No main keep but other buildings | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2023 | 38.90475, 141.25291 |
| Kawashima Castle | Kawashima Castle | 川島城 | Hilltop | Reconstructed main keep | Pre Edo Period | Tokushima Prefecture | Viewer Contributed | 2013 | 34.06616, 134.32033 |
| Kawashimamurako Castle | Kawashimamurako Castle | 河島村古城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.92452, 137.10721 |
| Kawawada Castle | Kawawada Castle | 河和田城 | Flatland | Ruins only | Pre Edo Period | Ibaraki Prefecture | Viewer Contributed | 2018 | 36.36845, 140.4147 |
| Kaya Yakata | Kaya Yakata | 賀陽館 | Fortified Manor | Ruins only | Pre Edo Period | Okayama Prefecture | Viewer Contributed | 2022 | 34.66318, 133.84534 |
| Kazama Yakata | Kazama Yakata | 風間館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.63796, 138.22843 |
| Kazama Yashiki (Kai) | Kazama Yashiki (Kai) | 甲斐風間屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.69743, 138.72565 |
| Kazue Yashiki (Nukata) | Kazue Yashiki (Nukata) | 額田主計屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.93061, 137.34881 |
| Kazurayama Castle | Kazurayama Castle | 葛山城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | 2014 | 2014 | 35.20608, 138.89344 |
| Kazurayama Yakata | Kazurayama Yakata | 葛山館 | Fortified Manor | Ruins only | Pre Edo Period | Shizuoka Prefecture | 2014 | 2023 | 35.20608, 138.89344 |
| Keirozan Castle | Keirozan Castle | 鶏籠山城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | 2012 | 2023 | 34.8726, 134.54522 |
| Kemi Castle (Chiisagata) | Kemi Castle (Chiisagata) | 小県花見城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.42337, 138.28313 |
| Kemi Castle (Chikuma) | Kemi Castle (Chikuma) | 筑摩花見城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.37127, 137.95997 |
| Kemurino Castle (Murakami Clan Fort Network) | Kemurino Castle (Murakami Clan Fort Network) | 村上煙ノ城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.42424, 138.21223 |
| Ken Castle (Kozuke) | Ken Castle (Kozuke) | 上野剣城 | Fortified Manor | Ruins only | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2021 | 36.45801, 139.02006 |
| Kesadaira Castle | Kesadaira Castle | 今朝平城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.13794, 137.32463 |
| Kibune Castle | Kibune Castle | 木舟城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.48514, 137.87701 |
| Kibyu Castle | Kibyu Castle | 黍生城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.13625, 137.29395 |
| Kido Castle (Mikawa) | Kido Castle (Mikawa) | 三河木戸城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 34.89314, 137.09049 |
| Kidoko Castle (Mikawa) | Kidoko Castle (Mikawa) | 三河木戸古城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2025 | 34.89596, 137.09077 |
| Kiga Jin'ya | Kiga Jin'ya | 気賀陣屋 | Hilltop | Ruins only | Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.80974, 137.65438 |
| Kikkawa Motoharu Yakata | Kikkawa Motoharu Yakata | 吉川元春館 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Hiroshima Prefecture | Viewer Contributed | 2020 | 34.71706, 132.46639 |
| Kikuchi Castle | Kikuchi Castle | 鞠智城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Kumamoto Prefecture | Viewer Contributed | 2009 | 33.00233, 130.78832 |
| Kimura Castle | Kimura Castle | 木村城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | 2021 | 2023 | 35.14408, 136.12755 |
| Kinebuchi Yakata | Kinebuchi Yakata | 杵淵館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.57366, 138.18209 |
| Kinojo | Kinojo | 鬼ノ城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Okayama Prefecture | 2010 | 2011 | 34.72828, 133.7652 |
| Kinoshita Castle | Kinoshita Castle | 木ノ下城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.37885, 136.94277 |
| Kinowa Castle | Kinowa Castle | 城輪柵 | Flatland | No main keep but other buildings | Pre Edo Period | Yamagata Prefecture | Viewer Contributed | 2023 | 38.96373, 139.90926 |
| Kinzan Castle | Kinzan Castle | 金山城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | 2024 | 2025 | 35.11228, 135.11385 |
| Kirarazaka Castle | Kirarazaka Castle | 雲母坂城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2021 | 2022 | 35.05507, 135.81031 |
| Kiridohshi Jin'ya | Kiridohshi Jin'ya | 切通陣屋 | Fortified Manor | Ruins only | Edo Period | Gifu Prefecture | Viewer Contributed | 2024 | 35.39872, 136.79699 |
| Kiridouzan Noroshidai | Kiridouzan Noroshidai | 霧訪山狼煙台 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.06395, 137.95107 |
| Kirihara Castle | Kirihara Castle | 桐原城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2015 | 2016 | 36.23671, 138.02657 |
| Kirihara Castle (Minochi) | Kirihara Castle (Minochi) | 水内桐原城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.66478, 138.21585 |
| Kirihara Yakata | Kirihara Yakata | 桐原館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.23147, 138.01767 |
| Kiriyama Castle | Kiriyama Castle | 霧山城 | Mountaintop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2024 | 34.52348, 136.2895 |
| Kisai Castle | Kisai Castle | 騎西城 | Flatland | Reconstructed main keep | Pre Edo Period | Saitama Prefecture | Viewer Contributed | 2011 | 36.1045, 139.58364 |
| Kishiwada Castle | Kishiwada Castle | 岸和田城 | Flatland | Reconstructed main keep | Edo Period | Osaka | 2013 | 2006 | 34.45896, 135.37066 |
| Kiso Daikansho | Kiso Daikansho | 木曽代官所 | Flatland | No main keep but other buildings | Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.85186, 137.69816 |
| Kiso Yoshinaka Yakata | Kiso Yoshinaka Yakata | 木曽義仲館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.89429, 137.7664 |
| Kisotono Yashiki | Kisotono Yashiki | 木曽殿屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.6476, 138.16902 |
| Kissatsu Castle | Kissatsu Castle | 切差城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2024 | 35.73047, 138.62918 |
| Kita Kumai Castle | Kita Kumai Castle | 北熊井城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2019 | 36.13082, 137.98224 |
| Kita Majino Castle | Kita Majino Castle | 北真志野城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.01349, 138.08794 |
| Kita Tsuda Castle | Kita Tsuda Castle | 北津田城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.1698, 136.08167 |
| Kita Wakamiko Castle | Kita Wakamiko Castle | 北若神子城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.79984, 138.42311 |
| Kitaaranami Fort | Kitaaranami Fort | 北新波砦 | Flatland | No main keep but other buildings | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2022 | 36.36555, 138.97051 |
| Kitabatakeshi Yakata | Kitabatakeshi Yakata | 北畠氏館 | Fortified Manor | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2020 | 34.51844, 136.29906 |
| Kitabatakeshi Yakata Tsumenoshiro | Kitabatakeshi Yakata Tsumenoshiro | 北畠氏館詰城 | Mountaintop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2025 | 34.51922, 136.29693 |
| Kitabodaiji Castle (Omi) | Kitabodaiji Castle (Omi) | 近江北菩提寺城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2021 | 35.14514, 136.23171 |
| Kitagata Castle (Ibi) | Kitagata Castle (Ibi) | 揖斐北方城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.50736, 136.53432 |
| Kitagata Castle (Motosu) | Kitagata Castle (Motosu) | 本巣北方城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.43709, 136.69165 |
| Kitagata Jin'ya | Kitagata Jin'ya | 北方陣屋・本巣北方城 | Flatland | Ruins only | Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.43752, 136.69071 |
| Kitagejou Fort | Kitagejou Fort | 北下条塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72749, 138.44443 |
| Kitagejou Yashiki | Kitagejou Yashiki | 北下条屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72559, 138.44675 |
| Kitamura Castle (Omi) | Kitamura Castle (Omi) | 近江北村城 | Flatland | No main keep but other buildings | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.09799, 136.04062 |
| Kitano Castle (Ina) | Kitano Castle (Ina) | 伊那北ノ城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.77266, 137.96028 |
| Kitanosho Castle | Kitanosho Castle | 北ノ庄城 | Flatland | Ruins only | Pre Edo Period | Fukui Prefecture | 2006 | 2006 | 36.06024, 136.21971 |
| Kitanosho Castle (Omi) | Kitanosho Castle (Omi) | 近江北ノ庄城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.14977, 136.08599 |
| Kitasudayama Castle (Omi) | Kitasudayama Castle (Omi) | 近江北須田山城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.16537, 136.16283 |
| Kitatsumeno Fort | Kitatsumeno Fort | 北爪ノ砦 | Flatland | Ruins only | Pre Edo Period | Gunma Prefecture | Viewer Contributed | 2022 | 36.36421, 138.97617 |
| Kitsuki Castle | Kitsuki Castle | 杵築城 | Hilltop | Reconstructed main keep | Edo Period | Oita Prefecture | Viewer Contributed | 2011 | 33.41475, 131.62767 |
| Kitsune Castle (Azumi) | Kitsune Castle (Azumi) | 安曇狐城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.36815, 137.92787 |
| Kitsuneyashiki Yakata | Kitsuneyashiki Yakata | 狐屋敷館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.28054, 137.98346 |
| Kiyomizu Castle (Ina) | Kiyomizu Castle (Ina) | 伊那清水城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.86973, 137.96863 |
| Kiyosaki Castle (Echigo) | Kiyosaki Castle (Echigo) | 越後清崎城 | Flatland | Ruins only | Edo Period | Niigata Prefecture | Viewer Contributed | 2021 | 37.04058, 137.86416 |
| Kiyosu Castle | Kiyosu Castle | 清洲城 | Flatland | Reconstructed main keep | Pre Edo Period | Aichi Prefecture | 1995 | 1999 | 35.21655, 136.84351 |
| Kizu Castle | Kizu Castle | 木津城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2023 | 2024 | 34.73197, 135.83009 |
| Kobinata Oh'yashiki | Kobinata Oh'yashiki | 小日向大屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.28511, 138.00992 |
| Kobushi Castle (Tsuru) | Kobushi Castle (Tsuru) | 都留小伏城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.66932, 139.10294 |
| Kochi Castle | Kochi Castle | 高知城 | Hilltop | Original main keep | Edo Period | Kochi Prefecture | 2001 | 2001 | 33.56068, 133.53125 |
| Kodera Castle (Mino) | Kodera Castle (Mino) | 美濃小寺城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2025 | 35.43698, 136.53988 |
| Kofu Castle | Kofu Castle | 甲府城 | Hilltop | No main keep but other buildings | Edo Period | Yamanashi Prefecture | 2003
2007
2015
2017 | 2003 | 35.66535, 138.57092 |
| Koga Castle | Koga Castle | 古河城 | Flatland | Ruins only | Pre Edo Period | Ibaraki Prefecture | Viewer Contributed | 2022 | 36.19171, 139.70082 |
| Kogamine Castle (Kyoto) | Kogamine Castle (Kyoto) | 甲ケ峯城 | Mountaintop | Ruins only | Pre Edo Period | Kyoto | 2023 | 2024 | 35.30199, 135.3224 |
| Kogane Castle | Kogane Castle | 小金城 | Hilltop | Ruins only | Pre Edo Period | Chiba Prefecture | 2015 | 2015 | 35.83616, 139.92249 |
| Kogane Castle (Mikawa) | Kogane Castle (Mikawa) | 三河小金城 | Mountaintop | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.91048, 137.30471 |
| Kohyama Castle | Kohyama Castle | 香山城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | 2023 | 2024 | 34.95322, 134.54122 |
| Koibuchi Castle | Koibuchi Castle | 鯉淵城 | Flatland | Ruins only | Pre Edo Period | Ibaraki Prefecture | Viewer Contributed | 2018 | 36.34947, 140.37104 |
| Koide Castle (Ina) | Koide Castle (Ina) | 伊那小出城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.81989, 137.93299 |
| Koide Yakata (Tanba) | Koide Yakata | 小出館 | Fortified Manor | Ruins only | Edo Period | Kyoto | 2023 | 2024 | 35.0868, 135.43861 |
| Koike Fort | Koike Fort | 小池砦 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.16961, 137.97498 |
| Koiwatake Castle | Koiwatake Castle | 小岩嶽城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.35485, 137.83512 |
| Kojima Castle (Hida) | Kojima Castle (Hida) | 飛騨小島城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2019 | 36.25171, 137.17487 |
| Kokokuji Castle | Kokokuji Castle | 興国寺城 | Hilltop | Ruins only | Pre Edo Period | Shizuoka Prefecture | 2014 | 2014 | 35.14144, 138.8069 |
| Kokura Castle | Kokura Castle | 小倉城 | Flatland | Reconstructed main keep | Edo Period | Fukuoka Prefecture | Viewer Contributed | 2006 | 33.88442, 130.87426 |
| Kokururi Castle | Kokururi Castle | 古久留里城 | Mountaintop | Ruins only | Pre Edo Period | Chiba Prefecture | 2021 | 2021 | 35.28918, 140.08923 |
| Kokuryou Castle (Omi) | Kokuryou Castle (Omi) | 近江国領城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.18615, 136.16519 |
| Kokuryou Castle (Tanba) | Kokuryou Castle (Tanba) | 丹波国領城 | Fortified Manor | Ruins only | Pre Edo Period | Hyogo Prefecture | Viewer Contributed | 2021 | 35.14567, 135.1306 |
| Kokuzousan Castle (Aida) | Kokuzousan Castle (Aida) | 会田虚空蔵山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.36761, 138.00988 |
| Kokuzousan Castle (Murakami Clan Fort Network) | Kokuzousan Castle (Murakami Clan Fort Network) | 村上虚空蔵山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.42998, 138.22138 |
| Kokuzousan Noroshidai | Kokuzousan Noroshidai | 虚空蔵山烽火台 | Mountaintop | No main keep but other buildings | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.23435, 138.43155 |
| Kokuzousanminami Fort (Aida) | Kokuzousanminami Fort (Aida) | 会田虚空蔵山南砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.36406, 138.01024 |
| Kokuzousannanseioneno Castle (Aida) | Kokuzousannanseioneno Castle (Aida) | 会田虚空蔵山南西尾根の城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.36334, 138.00431 |
| Kokuzousannishi Fort (Aida) | Kokuzousannishi Fort (Aida) | 虚空蔵山西砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.36648, 138.00434 |
| Komai Yashiki | Komai Yashiki | 駒井屋敷 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.73678, 138.44603 |
| Komaki Castle | Komaki Castle | 小牧城 | Mountaintop | Reconstructed main keep | Pre Edo Period | Aichi Prefecture | 1996 | 1999 | 35.29259, 136.91354 |
| Komaki Castle (Chiisagata) | Komaki Castle (Chiisagata) | 小県小牧城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.37527, 138.26174 |
| Komakijou Ohte Fort | Komakijou Ohte Fort | 小牧城大手砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.37573, 138.26424 |
| Komakikamino Castle (Chiisagata) | Komakikamino Castle (Chiisagata) | 小県小牧上ノ城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.37357, 138.2612 |
| Komaruyama Castle (Kiso) | Komaruyama Castle (Kiso) | 木曽小丸山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.84674, 137.69627 |
| Komaruyama Fort (Murakami Clan Fort Network) | Komaruyama Fort (Murakami Clan Fort Network) | 村上小丸山砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.41948, 138.27882 |
| Komasawa Castle | Komasawa Castle | 駒澤城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.53738, 137.81742 |
| Komatsu Castle | Komatsu Castle | 小松城 | Flatland | No main keep but other buildings | Edo Period | Ishikawa Prefecture | 2020 | 2019 | 36.41258, 136.44365 |
| Komatsu Castle (Sagami) | Komatsu Castle (Sagami) | 相模小松城 | Mountaintop | Ruins only | Pre Edo Period | Kanagawa Prefecture | Viewer Contributed | 2023 | 35.60292, 139.29118 |
| Komatsuyama Noroshidai | Komatsuyama Noroshidai | 小松山烽火台 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.69968, 138.56526 |
| Komazawa Castle (Minochi) | Komazawa Castle (Minochi) | 水内駒沢城 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.68089, 138.24524 |
| Komesu Castle | Komesu Castle | 米須グスク | Hilltop | Ruins only | Pre Edo Period | Okinawa Prefecture | Viewer Contributed | 2023 | 26.09762, 127.69632 |
| Komihanachi Castle | Komihanachi Castle | 小見放城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | 2023 | 2023 | 36.00144, 136.30158 |
| Komiyama Yakata | Komiyama Yakata | 小宮山館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.28427, 137.98282 |
| Komono Castle | Komono Castle | 菰野城 | Flatland | No main keep but other buildings | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2022 | 35.01275, 136.50866 |
| Komori Castle (Omi) | Komori Castle (Omi) | 近江小森城 | Flatland | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.1117, 136.08293 |
| Komori Yakata (Sarashina) | Komori Yakata (Sarashina) | 更級小森館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.57118, 138.16269 |
| Komoro Castle | Komoro Castle | 小諸城 | Hilltop | No main keep but other buildings | Edo Period | Nagano Prefecture | 2008 | 2008 | 36.32736, 138.41722 |
| Kongouji Castle (Murakami Clan Fort Network) | Kongouji Castle (Murakami Clan Fort Network) | 村上金剛寺城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.41778, 138.28464 |
| Kongouji Castle (Omi) | Kongouji Castle (Omi) | 近江金剛寺城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.12434, 136.11567 |
| Konishi Castle (Ina) | Konishi Castle (Ina) | 伊那小西城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.04571, 137.95421 |
| Konodai Castle | Konodai Castle | 国府台城 | Hilltop | Ruins only | Pre Edo Period | Chiba Prefecture | 2021 | 2021 | 35.74707, 139.90028 |
| Konosumiyama Castle | Konosumiyama Castle | 此隅山城 | Mountaintop | Ruins only | Pre Edo Period | Hyogo Prefecture | 2013 | 2013 | 35.48772, 134.87281 |
| Koori Nishiyama Castle | Koori Nishiyama Castle | 桑折西山城 | Mountaintop | Ruins only | Pre Edo Period | Fukushima Prefecture | 2020 | 2021 | 37.85571, 140.50985 |
| Koraku Castle | Koraku Castle | 狐落城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.43638, 138.17231 |
| Korin Castle (Ina) | Korin Castle (Ina) | 伊那狐林城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.8457, 137.96079 |
| Koriyama Castle (Hiroshima) | Koriyama Castle | 郡山城 | Mountaintop | Ruins only | Pre Edo Period | Hiroshima Prefecture | 2018 | 2019 | 34.67362, 132.70951 |
| Koromo Castle | Koromo Castle | 拳母城 | Hilltop | No main keep but other buildings | Edo Period | Aichi Prefecture | 2020 | 2019 | 35.07976, 137.15056 |
| Koromogawa Date | Koromogawa Date | 衣川館 | Fortified Manor | Reconstructed main keep | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2023 | 38.99722, 141.11365 |
| Kosakajinja Yakata | Kosakajinja Yakata | 小坂神社館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.63121, 138.28394 |
| Kose Yashiki (Kai) | Kose Yashiki (Kai) | 甲斐小瀬屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.62687, 138.58178 |
| Kosema Castle | Kosema Castle | 古瀬間城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.06831, 137.1994 |
| Koshibami Castle | Koshibami Castle | 小柴見城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.6467, 138.17489 |
| Koshigoe Castle | Koshigoe Castle | 腰越城 | Mountaintop | Ruins only | Pre Edo Period | Saitama Prefecture | 2015 | 2015 | 36.04446, 139.23234 |
| Koshikou Castle (Chikuma) | Koshikou Castle (Chikuma) | 筑摩古司口城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.44812, 138.05164 |
| Kosobu Yakata | Kosobu Yakata | 小曽部館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.10833, 137.8937 |
| Kosodeonzakijinja Castle | Kosodeonzakijinja Castle | 小袖御崎神社城 | Flatland | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.77502, 138.44917 |
| Kosuge Castle | Kosuge Castle | 小菅城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.76189, 138.93951 |
| Kosugeyama Yakata | Kosugeyama Yakata | 小菅山館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.50667, 137.92587 |
| Koteshiro Fort | Koteshiro Fort | 小手城砦 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2025 | 35.68011, 138.62214 |
| Kotsukuri Castle | Kotsukuri Castle | 木造城 | Flatland | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2024 | 34.6589, 136.49762 |
| Kotsukuriko Castle | Kotsukuriko Castle | 木造古城 | Hilltop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2024 | 34.65725, 136.49669 |
| Koudaiji Fort | Koudaiji Fort | 光台寺塁 | Flatland | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.74261, 138.43788 |
| Kouji Yakata | Kouji Yakata | 越氏館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.35006, 137.94619 |
| Koujin'o Castle | Koujin'o Castle | 荒神尾城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.30939, 137.9963 |
| Koujin'yama Castle (Ina) | Koujin'yama Castle (Ina) | 伊那荒神山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 35.96517, 137.99102 |
| Koujin'yama Noroshidai | Koujin'yama Noroshidai | 荒神山烽火台 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.70898, 138.69414 |
| Kouka Saburo Yashiki | Kouka Saburo Yashiki | 高家三郎屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2023 | 35.6094, 138.65439 |
| Koumyo Castle | Koumyo Castle | 光明城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.91782, 137.85951 |
| Koumyoji Yakata | Koumyouji Yakata | 光明寺館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.16365, 137.95805 |
| Kouno Yashiki (Kai) | Kouno Yashiki (Kai) | 甲斐河野屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.69005, 138.70097 |
| Kounomine Castle | Kounomine Castle | 髙嶺城 | Mountaintop | Ruins only | Pre Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2012 | 34.18436, 131.46214 |
| Kounoshou Castle (Omi) | Kounoshou Castle (Omi) | 近江香庄城 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.13949, 136.12379 |
| Kouriki Castle (Mikawa) | Kouriki Castle (Mikawa) | 三河高力城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.88637, 137.16974 |
| Kouyama Castle (Bingo) | Kouyama Castle (Bingo) | 備後甲山城 | Mountaintop | Ruins only | Pre Edo Period | Hiroshima Prefecture | Viewer Contributed | 2020 | 34.8533, 132.95623 |
| Kouyama Castle (Nagato) | Kouyama Castle (Nagato) | 長門甲山城 | Mountaintop | Ruins only | Pre Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 33.96254, 130.95332 |
| Koya Castle | Koya Castle | 小屋城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.42813, 137.93948 |
| Koya Castle (Chikuma) | Koya Castle (Chikuma) | 筑摩こや城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.35807, 137.93472 |
| Koyaba Castle | Koyaba Castle | 小屋場城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.49205, 137.90601 |
| Koyama Castle | Koyama Castle | 小山城 | Hilltop | Reconstructed main keep | Pre Edo Period | Shizuoka Prefecture | 2011 | 2011 | 34.77888, 138.24702 |
| Koyama Castle (Kai) | Koyama Castle (Kai) | 甲斐小山城 | Hilltop | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.61793, 138.65661 |
| Koyamura Yashiki | Koyamura Yashiki | 小屋村屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.10805, 137.96482 |
| Kozubeta Castle | Kozubeta Castle | 上津部田城 | Mountaintop | Ruins only | Pre Edo Period | Mie Prefecture | Viewer Contributed | 2024 | 34.74571, 136.50035 |
| Kozukue Castle | Kozukue Castle | 小机城 | Hilltop | Ruins only | Pre Edo Period | Kanagawa Prefecture | 2010 | 2010 | 35.51262, 139.59433 |
| Kozutsumi Castle | Kozutsumi Castle | 小堤城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.06483, 136.05691 |
| Kubo Castle (Mikawa) | Kubo Castle (Mikawa) | 三河久保城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 34.93898, 137.37046 |
| Kubodera Castle | Kubodera Castle | 窪寺城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.63788, 138.16432 |
| Kubodono Yashiki | Kubodono Yashiki | 久保殿屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.35709, 137.93038 |
| Kuboe Castle (Omi) | Kuboe Castle (Omi) | 近江窪江城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 34.98092, 135.91531 |
| Kubota Castle | Kubota Castle | 久保田城 | Hilltop | No main keep but other buildings | Edo Period | Akita Prefecture | 2018 | 2011 | 39.72348, 140.12324 |
| Kubota Castle (Nukata) | Kubota Castle (Nukata) | 額田久保田城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.89241, 137.18598 |
| Kuboyashiki (Koka) | Kuboyashiki (Koka) | 公方屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2022 | 34.884, 136.22875 |
| Kuboyashikishi Castle (Koka) | Kuboyashikishi Castle (Koka) | 公方屋敷支城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2022 | 34.8846, 136.22563 |
| Kugo Castle (Mikawa) | Kugo Castle (Mikawa) | 三河供御城 | Fortified Manor | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.95073, 137.15977 |
| Kukuri Castle | Kukuri Castle | 久々利城 | Mountaintop | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.40449, 137.1131 |
| Kukyudaira Castle (Mikawa) | Kukyudaira Castle (Mikawa) | 九久平城 | Mountaintop | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2024 | 35.05293, 137.21408 |
| Kuma Castle | Kuma Castle | 熊城 | Mountaintop | Ruins only | Pre Edo Period | Yamanashi Prefecture | 2017 | 2017 | 35.70153, 138.60151 |
| Kumagawa Castle | Kumagawa Castle | 熊川城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | 2024 | 2025 | 35.44103, 135.89882 |
| Kumagawa Jinya | Kumagawa Jinya | 熊川陣屋 | Flatland | Ruins only | Edo Period | Fukui Prefecture | 2024 | 2025 | 35.44328, 135.90127 |
| Kumagura Yakata | Kumagura Yakata | 熊倉館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.28433, 137.94013 |
| Kumamoto Castle | Kumamoto Castle | 熊本城 | Hilltop | Reconstructed main keep | Edo Period | Kumamoto Prefecture | Viewer Contributed | 2005 | 32.80617, 130.70573 |
| Kunaishoyu Castle | Kunaishoyu Castle | 宮内少輔城 | Fortified Manor | Ruins only | Pre Edo Period | Kyoto | 2021 | 2022 | 35.04608, 135.79457 |
| Kuniyoshi Castle | Kuniyoshi Castle | 国吉城 | Mountaintop | Ruins only | Pre Edo Period | Fukui Prefecture | Viewer Contributed | 2023 | 35.61477, 135.9647 |
| Kuno Castle | Kuno Castle | 久野城 | Hilltop | Ruins only | Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.76651, 137.92951 |
| Kunohe Castle | Kunohe Castle | 九戸城 | Hilltop | Ruins only | Pre Edo Period | Iwate Prefecture | 2010 | 2010 | 40.26699, 141.30366 |
| Kunori Yakata | Kunori Yakata | 九之里館 | Fortified Manor | Ruins only | Pre Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.12434, 136.11184 |
| Kunou Castle | Kunou Castle | 久能城 | Mountaintop | Ruins only | Pre Edo Period | Shizuoka Prefecture | Viewer Contributed | 2021 | 34.96527, 138.46791 |
| Kurahone Castle | Kurahone Castle | 鞍骨城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.54291, 138.18097 |
| Kuraji Castle (Koka) | Kuraji Castle (Koka) | 倉治城 | Hilltop | Ruins only | Pre Edo Period | Shiga Prefecture | 2022 | 2022 | 34.92382, 136.16345 |
| Kuranomae Fort | Kuranomae Fort | 蔵之前塁 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72671, 138.45 |
| Kurata Castle (Ina) | Kurata Castle (Ina) | 伊那倉田城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 35.87633, 137.98319 |
| Kurihara Yakata | Kurihara Yakata | 栗原館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.66588, 138.69794 |
| Kurita Castle | Kurita Castle | 栗田城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed
2023 | 2020 | 36.63792, 138.1943 |
| Kuriyagawa no Saku | Kuriyagawa no Saku | 厨川柵 | Flatland | No main keep but other buildings | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2023 | 39.71168, 141.12139 |
| Kurobane Castle | Kurobane Castle | 黒羽城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Tochigi Prefecture | 2021
Viewer Contributed | 2018 | 36.86973, 140.12214 |
| Kuroda Daikansho | Kuroda Daikansho | 黒田代官所 | Flatland | No main keep but other buildings | Edo Period | Shizuoka Prefecture | Viewer Contributed | 2024 | 34.69908, 138.08429 |
| Kuroi Castle | Kuroi Castle | 黒井城 | Mountaintop | No main keep but other buildings | Pre Edo Period | Hyogo Prefecture | 2023 | 2020 | 35.17882, 135.10471 |
| Kurokawashi Castle (Koka) | Kurokawashi Castle (Koka) | 黒川氏城 | Mountaintop | Ruins only | Edo Period | Shiga Prefecture | 2023 | 2023 | 34.95157, 136.34 |
| Kurono Castle | Kurono Castle | 黒野城 | Flatland | Ruins only | Pre Edo Period | Gifu Prefecture | Viewer Contributed | 2021 | 35.45993, 136.72416 |
| Kuruma Castle | Kuruma Castle | 来馬城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.82536, 137.9016 |
| Kuruma Castle (Hanishina) | Kuruma Castle (Hanishina) | 埴科車城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.58772, 138.22643 |
| Kurumayama Castle (Hanishina) | Kurumayama Castle (Hanishina) | 埴科車山城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2023 | 36.58752, 138.22898 |
| Kurume Castle | Kurume Castle | 久留米城 | Hilltop | Ruins only | Edo Period | Fukuoka Prefecture | Viewer Contributed | 2013 | 33.32843, 130.50777 |
| Kururi Castle | Kururi Castle | 久留里城 | Mountaintop | Reconstructed main keep | Edo Period | Chiba Prefecture | 2005
2021 | 2005 | 35.28755, 140.08993 |
| Kusama Bizennokami Yakata | Kusama Bizennokami Yakata | 草間肥前守館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.25998, 137.89854 |
| Kushiki Castle (Chikuma) | Kushiki Castle (Chikuma) | 筑摩櫛木城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.19268, 137.84209 |
| Kushima Castle | Kushima Castle | 玖島城 | Hilltop | No main keep but other buildings | Edo Period | Nagasaki Prefecture | Viewer Contributed | 2009 | 32.89616, 129.95707 |
| Kushizaki Castle | Kushizaki Castle | 櫛崎城 | Hilltop | Ruins only | Pre Edo Period | Yamaguchi Prefecture | Viewer Contributed | 2021 | 33.98934, 130.99378 |
| Kutsukake Castle | Kutsukake Castle | 沓掛城 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | 2020 | 2020 | 35.06899, 137.02183 |
| Kutsukakemura Fort | Kutsukakemura Fort | 沓掛村砦 | Flatland | Ruins only | Pre Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 35.06093, 137.02213 |
| Kutsuki Izuminokami Jin'ya | Kutsuki Izuminokami Jin'ya | 朽木和泉守陣屋 | Flatland | Ruins only | Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.14771, 136.09033 |
| Kutsuki Shuzen Jin'ya | Kutsuki Shuzen Jin'ya | 朽木主膳陣屋 | Flatland | Ruins only | Edo Period | Shiga Prefecture | Viewer Contributed | 2022 | 35.13909, 136.08705 |
| Kuwabara Castle | Kuwabara Castle | 桑原城 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | 2007 | 2007 | 36.02582, 138.14029 |
| Kuwagatahara Noroshidai | Kuwagatahara Noroshidai | 鍬形原烽火台 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.19835, 137.99085 |
| Kuwai Castle (Mikawa) | Kuwai Castle (Mikawa) | 三河桑谷城 | Flatland | Ruins only | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34.89115, 137.2208 |
| Kuwana Castle | Kuwana Castle | 桑名城 | Flatland | No main keep but other buildings | Edo Period | Mie Prefecture | Viewer Contributed | 2013 | 35.06463, 136.69872 |
| Kyara Palace | Kyara Palace | 伽羅御所 | Fortified Manor | No main keep but other buildings | Pre Edo Period | Iwate Prefecture | Viewer Contributed | 2023 | 38.99103, 141.11816 |
| Kyotoshin Castle | Kyotoshin Castle | 京都新城 | Flatland | Ruins only | Pre Edo Period | Kyoto | Viewer Contributed | 2020 | 35.02144, 135.7643 |
| Kyouraishi Yashiki | Kyouraishi Yashiki | 教来石屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.83821, 138.30402 |
| Kyouraishiminbu Yakata | Kyouraishiminbu Yakata | 教来石民部館 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.83173, 138.30076 |
| Machimura Fort | Machimura Fort | 町村砦 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36.12907, 137.97764 |
