Sometimes I will see people doubt the existence of the basketball court inside the Matterhorn at Disneyland. Most people, though, seem to know by now that this particular urban legend is true (well, it’s not exactly a full-sized court, but it’s there).
The only debate now is whether it was built to fall into a loophole in building codes that only allowed tall buildings in Anaheim if they were gymnasiums.
Sources:
Pictures 1 and 2
Picture 3
Picture 4