This unassuming layer of clay boasts an out-of-this-world origin story.

These half-buried combine harvesters just off Route 66 are an homage to the Cadillac Ranch.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

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

Colorado's only true geyser is hidden within the San Juan National Forest.

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

Abandoned silver mine strewn with wrecked and twisted structures.

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

This spectacular track has run continuously since 1882.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

The largest self-built castle in the U.S., six decades in the making.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

A technicolor place of worship for Elevationists.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

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