This underwater old Texas hill town only resurfaces during harsh drought.

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

One of the largest ochre quarries in the world, hidden in a limestone landscape.

Climb to the top of this spiritual tower, and you'll be rewarded with spectacular views.

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

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

A mental health hospital dating back more than 139 years, now features a museum.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

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

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

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