Abandoned silver mine strewn with wrecked and twisted structures.

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

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

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

The highest bridge in America was built for an almost unnervingly small amount of money.

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

When ecosystems collide in the arid Southwest.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

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

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.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

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

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

Largest collection of mounted dinosaur specimens in the world.

Perhaps the oldest vine in North America, this sprawling plant helps make a sweet wine.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

The ruined remains of a coal mining ghost town are hidden within the woods.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

Collection of vintage trailers double as hotel rooms.

This massive solar generating facility in the Nevada desert has been plagued by difficulties.

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