The Castle That Never Was (in Japanese: 存在しなかった世界, Sonzai Shinakatta Sekai) is a flying, high-tech grand castle that is both home to Organization XIII and their main headquarters, and it first appeared in Kingdom Hearts II and later reappeared in both Kingdom Hearts 358/2 Days and Kingdom Hearts 3D: Dream Drop Distance. It is also found floating in place at the heart of the homeworld of the Nobodies, just above the world's Dark City. Sora and his allies with the help of Ansem the Wise, entered the Castle and defeated the Organization XIII and their leader Xemnas on their turf.