Osaka Castle (大坂城)

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Osaka Castle (大坂城・大阪城, Ōsaka-jō?) is a Japanese castle in Chūō-ku, Osaka, Osaka Prefecture, Japan.

Originally called Ozakajō, it is one of Japan's most famous castles, and played a major role in the unification of Japan during the sixteenth century of the Azuchi-Momoyama period. Osaka Castle is situated on a plot of land roughly one kilometer square (1100 yards square). It is built on two raised platforms of landfill supported by sheer walls of cut rock, using a technique called Burdock piling, each overlooking a moat. The central castle building is five stories on the outside and eight stories on the inside, and built atop a tall stone foundation to protect its occupants from sword-bearing attackers.

source: Wikipedia