A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

A toxic ghost town sitting atop a massive coal fire.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Water of undetermined depth has attracted rare fish and cult leaders alike.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Mysterious glowing orbs float through the desert night.

A Prada store in the West Texas desert that is never open for business.

Minimalist modern art on a repurposed military base in rural Texas.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

What is the Thing?

Where beautiful signs live on forever.

This weird abode has inspired everything from the "House on Haunted Hill" to a robot hunter's pad.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A regular looking rock with an unbelievable history.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

Pennsylvania's own Roswell-style UFO mystery.

This collection of neon icons is preserving Arizona's history, one sign at a time.