A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

The iconic remains of the original Academic Hall that burned down in 1892.

Curious cave that stays a cool 56 degrees all year long.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

This ordinary street was made infamous by a legendary visit from the devil.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

These abandoned grain silos and tunnels are an urban exploration dream.

The abandoned summer estate of the former Greek Royal Family.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

Museum dedicated to the struggles of the disabled.

Ruins of a once-prized railroad station in New York.

A forsaken wonder in the middle of the East Side neighborhood.

A crumbling mountain resort that looks like it was abandoned in an instant.

Locals dubbed this abandoned abode the "gingerbread house" because of its odd architecture.

The abandoned shell of what would have been the Jordanian royal family's summer palace.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

Ruins of a historic medical facility sits eerily by the water.

The NBA player's elaborate former home is now a ghost of its old glory.

An abandoned amusement park hints at the twisted history of the Newfoundland Railway.

This remote fort on the Yukon River is a vestige of the wild Alaska gold rush.

Divers can encounter an abandoned warship encircled by a giant kraken submerged in the British Virgin Islands.

The haunting beauty of this little-visited wreck makes it a true hidden treasure.