Who built Bowser's castles?

In Paper Mario, a new Bowser's Castle is secretly built right underneath Princess Peach's Castle and Bowser lifts it into the sky, kidnapping Princess Peach, along with her castle. read more

Actually part of the story was that the citizens of the Mushroom Kingdom were all turned into bricks by Bowser, so I assume that the castles may have been built with said bricks. 390 Views Sarita Soto, Nice, mean, and everything in between. read more

Bowser's Castle is usually the final area that Mario and his friends visit to defeat Bowser and rescue Peach and is usually guarded by Bowser's most powerful minions. In the Mario spin-offs, the castle can serve as a go-kart course, a tennis court, a baseball stadium, etc., depending on the sport the game is based on. read more

In Super Mario Bros. 3, not only that Bowser's Castle, called "Castle of Koopa" (also "Castle of Kuppa" in the videogame's Japanese version) was the game's final destination once again, but an entire world was built around it, called the "Dark Land". read more