Osaka Castle (大坂城 or 大阪城, Ōsaka-jō?) is a Japanese castle in Chūō-ku, Osaka, Japan. The castle is one of Japan's most famous, and played a major role in the unification of Japan during the sixteenth century of the Azuchi-Momoyama period. The main tower of Osaka Castle is situated on a plot of land roughly one square kilometer. 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 attackers. The Castle grounds, which cover approximately 60,000 square meters (15 acres) contain thirteen structures which have been designated as Important Cultural Assets by the Japanese government, including:
Enshogura Gunpowder Magazine
Three sections of castle wall all located around Otemon Gate.