A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

A hobby born from insomnia has turned into a hangar full of objects that have been be-buttoned by the Button King.

Ruins of a Carnegie family mansion on Cumberland Island.

4,000 monkeys used for medical testing on an island off of South Carolina.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

Curious rock formations in a tiny Kansas state park.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

An urban forest overtakes what was the greatest failure of utopic urban housing.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The largest self-built castle in the U.S., six decades in the making.

One of the smallest towns in the United States.

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

“You better take care of me Lord, if you don't you're gonna have me on your hands.” ― Hunter S. Thompson, Fear and Loathing in Las Vegas.

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

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

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

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

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

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

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

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

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