Here are some pics of Japanese castles:

Himeji castle, Himeji City, Hyogo Prefecture (west of Osaka):







Next is Kitsuki castle, on Kyushu island:




Iga castle, Ueno-shi, Mie Prefecture (east of Osaka). Famous as one of the two traditional ninja areas:




Kawahara castle, Tottori Prefecture (north-west of Osaka; on the north coast of Japan)








Couple more later.