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

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

European castle ruins in an American state park are actually the product of death and grief.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

The largest island on the great salt lake is home to curious creatures and strange stories.

Three generations of intrepid collectors display their curious artifacts in a homemade museum right next to the caves they discovered.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

Home to the deepest rift anywhere on Earth.

A popular rock that acted as a waymarker for American pioneers.

These giant metal horses graze on a hilltop near the Montana highway.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

A miraculous natural phenomenon known as "the spring that breathes."

Native Americans built this circle of stones, which was used to predict astronomical events.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

The highest point in Montana is as rugged and singular as the state itself.