Supposedly Satanic numbers adorn this preserved submarine sail.

Home to the deepest rift anywhere on Earth.

This museum glorifies the humble potato.

Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

An experimental, automotive replica of Stonehenge.

This erect, phallic geological spire wasn't always named so domestically.

This subterranean treasure trove is said to contain a motorcycle, a Chevy, and a teal leisure suit.

An idle pastime becomes a record holder in Boys Town, Nebraska.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Symbolic attempt to overcome the issues of life.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

The world's longest known cave system.

One of the few surviving "Wigwam"-themed motels.

Amazing taxidermy dioramas from the 1960s in a cement building meant to look like an ice cave.

An abandoned theme park with a strange and tumultuous past.

Prehistoric animals decorate this popular outdoor park.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Calidum et Deliciose Succosum!

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The ominously named cave is home to some remarkable ancient art.

A volcanic crater that visitors can look inside.

This large round boulder is said to emit spiritual power, but it may just be magnets.

The world's most remote airport.

This was once the center of the Birdman cult, and is now a World Heritage Site.