|Greater Location||Mushroom Kingdom|
|First Appearance||Yoshi's Story (as Ghost Castle), Super Mario: An Evil Rising|
|Current Ruler||King Boo|
|Boo TV Stage|
After the Boo population increased after the Mushroom Behemoth Apocalypse, the boos crowned King Boo king and they built the castle. Shortly afterwards, the boos claimed land of the area and began to invade the rest of the kingdom via haunting.
Shortly before the event of SM:AER, Boos acquired a contract for a channel and named it the Boo Television Network, or Boo TV for short.
Boom Boom is banished to the Boo Castle in this game. It remains the stronghold of King Boo, but this time, Lady Bow as well. The Boo Castle is a major location in Boom Boom's story.
Boo Castle appears as a Stadium as King Boo's Mansion.