Bowser's Castle is basically just a regular castle. The only difference is that it has a giant Bowser head on the top. It has two towers on either side of the head, wich is in the middle. It is a dull brownish color, and is smaller than Princess Peach's Castle.
- In both Mario and Luigi: Superstar Saga and Mario and Luigi: Bowser's Inside Story Bowser's castle can fly.