This cave holds a surprisingly colorful variety of geological oddities.

The remains of a enormous earthen figure of unknown origins cuts across a rural Wisconsin road.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

The remains of an early 1900s dude ranch that operated until the 1970s.

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

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

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

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

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

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

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

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

A unique geological area spiked with wind-carved rocks that resemble teepees.

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

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

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

When ecosystems collide in the arid Southwest.

An architect's childhood fantasy treehouse made real.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Quite simply the largest tree in the world (by volume).

One of the world's oldest and most massive living organisms is a grove of quaking aspens.