A subterranean haunt where wine and homemade biscottis are always on the menu.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

This Chinese museum proves that it's a watermelon world, we're all just living in it.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.