Unknown Stage (Super Mario 64)

The Unknown Stage was a stage found in early beta footage of Super Mario 64''. ''There isn't to much known about it, but it looked like a fortress, and may have been a Bowser's Castle, or an extremely early Whomp's Fortress. There is another stage found, that was never seen. It only had a painting that depicted a grassy meadow, with for forest in the background, and mushrooms.