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

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

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

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

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

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This Central New York ghost town was once a prosperous railroad community.

An abandoned castle owned and ignored by Masons carries a cursed history.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

This spectacular track has run continuously since 1882.

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

When ecosystems collide in the arid Southwest.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

This dry lake bed contains the oldest known petroglyphs in North America.

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

A cult archaeology conspiracy theory claims these West Virginia petroglyphs were written by Irish monks in Ogham.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

Extraordinary objects lurk in this quintessential regional museum.

Outsider art meets paleontology at this roadside reptile repository.