A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A house carved into a rock in the 1940s.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

There's nothing creepier than a cemetery next to a clown motel.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

More than 5,000 contemporary and "historic" mustards from around the world.

A bizarre house filled with an astounding array of collections.

A place to eat for on-the-run agents and espionage enthusiasts.

Statue dedicated to the star of an old television show.

A large circus museum with summer performances.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A scenic fort on the harbor protected Philadelphia from an attack that never came.