Update by ART (January 2024; visited 2019):
Kokura Castle's main features are its survivng ishigaki (stone-piled ramparts), dorui (earthen ramparts) and mizubori (water moats). It also has a reconstructed donjon, built from concrete and serving as a museum, and other mock reconstructions. The castle ground's further contain a restored garden and villa used by the lords of the castle.
Mock Reconstructions:
The appearance of the tenshu at Kokurajō is not historically accurate; the museum building was erected in 1959 out of concrete, and, whilst it seems that the original form of the tenshu was well understood even then, it was decided that the new tenshu would be "beautified" with the addition of hafu (gables). This means that the tower does not even bear an outward resemblance to what existed historically in its place. Although unfortunate, this is more than enough justification in my opinion for it to be destroyed with prejudice, and reconstructed out of historical materials. The historically accurate keep would look more appealing and suitable.
The tenshu of Kokurajō was built in the karaźukuri (唐造) style. Karaźukuri, in this case, refers to the style wherein the uppermost tier is larger than the preceeding one. I have also heard the use of hoardings on Japanse castles referred to as nanbanźukuri ('barbarian style').
There are reconstructed yagura. One of three-tiers is called the nukagura (raw rice store), which I think is or was a restaurant. The others consist of a two-tier yagura connected by a corridor turret to the tenshu.
Also located on the castle grounds is a built-up shrine complex made up of shrine buildings and what I would call 'castle-inspired' structures. Although obviously not historically accurate I did find them quite interesting, representing to me a sort of nativist alternative to modern multistorey architecture.
Garden:
The garden at Kokura Castle is a traditional daimyō-style garden centered upon the reconstructed shoin (drawing room) of the detatched palace called Go'Yūsho (Place of Leisure), also referred to historically as the detached villa of the Ogasawara Clan. The villa was the heart of Ogasawara-ryū Reihō (School of Etiquette), cultivated by the lords of Kokura Castle. The restored complex consists of tea rooms, a library, an exhibition hall, and the reconstructed shoin, the balcony of which hangs delicately over the garden pond. The layout of the garden dates to 1798, arranged by Lord Ogasawara Tadamitsu. All original structures were destroyed in the Chōshū War of 1866. The site was excavated and restored in the 1990s.
Loading map...
{"format":"leaflet","minzoom":false,"maxzoom":false,"limit":500,"offset":0,"link":"all","sort":["order"],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"... further results","default":"","import-annotation":false,"width":"auto","height":"350px","centre":false,"title":"","label":"","icon":"Darkred18.png","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":false,"defzoom":14,"layers":["Esri.WorldTopoMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","showtitle":false,"hidenamespace":true,"template":"InfoWindowProfile","userparam":"","activeicon":"","pagelabel":false,"ajaxcoordproperty":"","ajaxquery":"","locations":[{"text":"\u003Cdiv style=\"width:150px\"\u003E\n\u003Cp\u003E\u003Ca href=\"/view/File:KokurajouART_(100).jpg\" class=\"image\"\u003E\u003Cimg alt=\"KokurajouART (100).jpg\" src=\"../images/thumb/c/c1/KokurajouART_%28100%29.jpg/125px-KokurajouART_%28100%29.jpg\" decoding=\"async\" width=\"125\" height=\"94\" srcset=\"../images/thumb/c/c1/KokurajouART_%28100%29.jpg/188px-KokurajouART_%28100%29.jpg 1.5x, ../images/thumb/c/c1/KokurajouART_%28100%29.jpg/250px-KokurajouART_%28100%29.jpg 2x\" data-file-width=\"1080\" data-file-height=\"810\" /\u003E\u003C/a\u003E\u003C!--MW-PAGEIMAGES-CANDIDATE-0--\u003E\n\u003C/p\u003E\n\u003C/div\u003E","title":"","link":"","lat":33.88554,"lon":130.87461,"icon":"../images/0/06/Darkred18.png"},{"text":"\u003Cdiv style=\"width:150px\"\u003E\n\u003Cp\u003E\u003Ca href=\"/view/File:KokurajouARTGoYuusho_(2).JPG\" class=\"image\"\u003E\u003Cimg alt=\"KokurajouARTGoYuusho (2).JPG\" src=\"../images/thumb/8/88/KokurajouARTGoYuusho_%282%29.JPG/125px-KokurajouARTGoYuusho_%282%29.JPG\" decoding=\"async\" width=\"125\" height=\"94\" srcset=\"../images/thumb/8/88/KokurajouARTGoYuusho_%282%29.JPG/188px-KokurajouARTGoYuusho_%282%29.JPG 1.5x, ../images/thumb/8/88/KokurajouARTGoYuusho_%282%29.JPG/250px-KokurajouARTGoYuusho_%282%29.JPG 2x\" data-file-width=\"1500\" data-file-height=\"1125\" /\u003E\u003C/a\u003E\u003C!--MW-PAGEIMAGES-CANDIDATE-1--\u003E\n\u003C/p\u003E\n\u003C/div\u003E","title":"","link":"","lat":33.88454,"lon":130.87531,"icon":"../images/0/06/Darkred18.png"},{"text":"\u003Cdiv style=\"width:150px\"\u003E\n\u003Cp\u003E\u003Ca href=\"/view/File:KokurajouART_(57).jpg\" class=\"image\"\u003E\u003Cimg alt=\"KokurajouART (57).jpg\" src=\"../images/thumb/2/2f/KokurajouART_%2857%29.jpg/125px-KokurajouART_%2857%29.jpg\" decoding=\"async\" width=\"125\" height=\"94\" srcset=\"../images/thumb/2/2f/KokurajouART_%2857%29.jpg/188px-KokurajouART_%2857%29.jpg 1.5x, ../images/thumb/2/2f/KokurajouART_%2857%29.jpg/250px-KokurajouART_%2857%29.jpg 2x\" data-file-width=\"1080\" data-file-height=\"810\" /\u003E\u003C/a\u003E\u003C!--MW-PAGEIMAGES-CANDIDATE-2--\u003E\n\u003C/p\u003E\n\u003C/div\u003E","title":"","link":"","lat":33.88447,"lon":130.87432,"icon":"../images/0/06/Darkred18.png"},{"text":"\u003Cdiv style=\"width:150px\"\u003E\n\u003Cp\u003E\u003Ca href=\"/view/File:KokurajouART_(32).jpg\" class=\"image\"\u003E\u003Cimg alt=\"KokurajouART (32).jpg\" src=\"../images/thumb/a/aa/KokurajouART_%2832%29.jpg/125px-KokurajouART_%2832%29.jpg\" decoding=\"async\" width=\"125\" height=\"94\" srcset=\"../images/thumb/a/aa/KokurajouART_%2832%29.jpg/188px-KokurajouART_%2832%29.jpg 1.5x, ../images/thumb/a/aa/KokurajouART_%2832%29.jpg/250px-KokurajouART_%2832%29.jpg 2x\" data-file-width=\"1080\" data-file-height=\"810\" /\u003E\u003C/a\u003E\u003C!--MW-PAGEIMAGES-CANDIDATE-3--\u003E\n\u003C/p\u003E\n\u003C/div\u003E","title":"","link":"","lat":33.8838,"lon":130.87385,"icon":"../images/0/06/Darkred18.png"},{"text":"\u003Cdiv style=\"width:150px\"\u003E\n\u003Cp\u003E\u003Ca href=\"/view/File:KokurajouART_(70).jpg\" class=\"image\"\u003E\u003Cimg alt=\"KokurajouART (70).jpg\" src=\"../images/thumb/2/20/KokurajouART_%2870%29.jpg/125px-KokurajouART_%2870%29.jpg\" decoding=\"async\" width=\"125\" height=\"94\" srcset=\"../images/thumb/2/20/KokurajouART_%2870%29.jpg/188px-KokurajouART_%2870%29.jpg 1.5x, ../images/thumb/2/20/KokurajouART_%2870%29.jpg/250px-KokurajouART_%2870%29.jpg 2x\" data-file-width=\"1080\" data-file-height=\"810\" /\u003E\u003C/a\u003E\u003C!--MW-PAGEIMAGES-CANDIDATE-4--\u003E\n\u003C/p\u003E\n\u003C/div\u003E","title":"","link":"","lat":33.88512,"lon":130.87327,"icon":"../images/0/06/Darkred18.png"},{"text":"\u003Cdiv style=\"width:150px\"\u003E\n\u003Cp\u003E\u003Ca href=\"/view/File:KokurajouART_(73).jpg\" class=\"image\"\u003E\u003Cimg alt=\"KokurajouART (73).jpg\" src=\"../images/thumb/f/f3/KokurajouART_%2873%29.jpg/125px-KokurajouART_%2873%29.jpg\" decoding=\"async\" width=\"125\" height=\"94\" srcset=\"../images/thumb/f/f3/KokurajouART_%2873%29.jpg/188px-KokurajouART_%2873%29.jpg 1.5x, ../images/thumb/f/f3/KokurajouART_%2873%29.jpg/250px-KokurajouART_%2873%29.jpg 2x\" data-file-width=\"1080\" data-file-height=\"810\" /\u003E\u003C/a\u003E\u003C!--MW-PAGEIMAGES-CANDIDATE-5--\u003E\n\u003C/p\u003E\n\u003C/div\u003E","title":"","link":"","lat":33.88509,"lon":130.87334,"icon":"../images/0/06/Darkred18.png"},{"text":"\u003Cdiv style=\"width:150px\"\u003E\n\u003Cp\u003E\u003Ca href=\"/view/File:KokurajouART_(47).jpg\" class=\"image\"\u003E\u003Cimg alt=\"KokurajouART (47).jpg\" src=\"../images/thumb/1/1a/KokurajouART_%2847%29.jpg/125px-KokurajouART_%2847%29.jpg\" decoding=\"async\" width=\"125\" height=\"94\" srcset=\"../images/thumb/1/1a/KokurajouART_%2847%29.jpg/188px-KokurajouART_%2847%29.jpg 1.5x, ../images/thumb/1/1a/KokurajouART_%2847%29.jpg/250px-KokurajouART_%2847%29.jpg 2x\" data-file-width=\"1080\" data-file-height=\"810\" /\u003E\u003C/a\u003E\u003C!--MW-PAGEIMAGES-CANDIDATE-6--\u003E\n\u003C/p\u003E\n\u003C/div\u003E","title":"","link":"","lat":33.88466,"lon":130.87391,"icon":"../images/0/06/Darkred18.png"}],"imageLayers":[]}
Leaflet | Tiles © Esri — Esri, DeLorme, NAVTEQ, TomTom, Intermap, iPC, USGS, FAO, NPS, NRCAN, GeoBase, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), and the GIS User Community