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Whomp's Fortress is the second area found throughout Super Mario 64. It is a grass fortress located in the sky and is the home to Whomps, Thwomps, and a bunch of other enemies. The place is ruled by the Whomp King.
It also has a large tower at the top of the fortress which has a hatch at the back that if punched, will reveal a 1-Up Mushroom. In Super Mario 64 DS, the course has received an extension. In SMG4's videos it is the most seen area from Super Mario 64 alongside Bob-Omb Battlefield and Peach's Castle.