A Saint Nicholas-themed ghost town in the Mojave desert.

Religious statues built because of one man's bargain with God fill this peaceful sculpture garden.

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

These free-roaming horses were once destined to disappear from the land.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

An homage to everyone's favorite prehistoric cartoon family.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

A bronze statue of Mister Rogers in the neighborhood where he grew up.

Pennsylvania's own Roswell-style UFO mystery.

Mysterious rocks that ring musically when struck.

A toxic ghost town sitting atop a massive coal fire.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

An abandoned relic of the city's failed experiment with below ground transit.