This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

A rare memento of a lost Indigenous group.

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

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

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

A saloon and inn that served the Wild West's most iconic figures—and is still haunted by some of them today.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

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

The largest source of fossilized insects anywhere.

This nearly abandoned town was once a thriving mining community until a series of fires.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

Community owned and operated, this property is home to a diverse set of nudists.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

A coal fire has been burning underground here since 1896.

Take a self-guided tour through one of Colorado's most elevated mining districts.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

A river runs through this remote valley in a very unexpected way.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

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

A hotel with a rich Wild West history of miners and bootleggers.

This spectacular track has run continuously since 1882.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

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

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