Osaka Castle is located in Chūō-ku, Osaka, Japan. It is one of the most famous castles in this area and played a major role in the unification of Japan during the 16th century.
The design of this castle is extremely unique. It was built on two raised platforms of landfill, supported by sheer walls of cut rock. The technique is called Burdock piling.
The central castle building is five stories on the outside and eight on the inside. It also has underground stories.
Construction began in 1583 under the rule of Toyotomi Hideyoshi. In 1615, Osakajo fell to Tokugawa clan. At that time Tokugawa Hidetada reconstructed the castle with many additions.
In 1868, much of the castle grounds were burned in the civil conflicts surrounding the Meiji Restoration. The structure was then converted to a barracks.
The last restoration on Osaka Castle took place from 1995-1997.
Today the castle grounds contain thirteen structures which have been designated as Important Cultural Assets by the Japanese government.