Goomba King's Fortress

The Goomba King's Fortress is a fortress that belongs to the Goomba King in Paper Mario. Mario sees the fortress after defeating the Red and Blue Goombas. After Mario defeats the Goomba King, the fortress breaks off and turns back into a bridge. When part of the fortress gets destroyed, it sends Goomba King flying through the air and he is not seen again in the game until the ending parade where the Red and Blue Goombas are trying to get him out of a tree which he landed in.

History
When the Goomba King was turned into a king by Bowser's Star Rod he probably built it for himself and the Red and Blue Goombas for a base.