There is an underground house close to where I live. It looks like a big mound of dirt in the middle of the woods with an outhouse sitting on top of it with a few vent pipes and antennas sticking out of it. The house was built by a man during the Y2K scare who believed the world was coming to an end, needless to say, he ain't from around here.

I think the man moved after he found out the world did not implode, or whatever it was suppose to do.