Little island known for its massive beachfront "flowerpot" pillars.

Steepest flood safety railway in the entire world.

The crumbling remains of a 19th century fortess.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

This freshwater spring fills with 10,000 gallons of water per minute.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Abandoned concert venue legendary for its rock counterculture.

Deep scars on the earth left by the Ice Age.

The center of the only hemisphere that awards visitors with a commemorative coin.

An abandoned asylum incorporated into a college campus.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The city is full of whimsical portals to another world.

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

Enormous lake at the bottom of a unique cave system.

One person's lost luggage is another person's treasure.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

This structure among the trees was the result of divine inspiration.

A castle built by an eccentric medieval enthusiast in rural Ohio.

A river with some unusual, and occasionally dangerous, habits.

An abandoned relic of the city's failed experiment with below ground transit.

A suspended garden, now gone, once hung in the middle of this abandoned church.