Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Enormous lake at the bottom of a unique cave system.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

This woodland architectural installation acts as a camera obscura for the heavens.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Exact replica of the ancient monument, but much, much lighter.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

An abandoned church gets a second life as a massive beer hall and event space.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Remnants of a storybook amusement park hidden behind a strip mall.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Mysterious rocks that ring musically when struck.