Known for the tunnel that leads visitors to the water.

Monument to a suicide protesting the Soviet invasion.

Waterway populated with abandoned projects, including a submarine.

Exotic feline breeding compound and conservation center.

World's first "penitentiary," meant to be humane, drove men insane.

The prototype for all Nazi concentration camps.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Experience park where visitors are told to expect the unexpected.

Canyon walls shrouded in ferns.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

Old Danish castle immortalized in Shakespeare's Hamlet.

Japanese island famous for poison gas and fluffy bunnies.

See massive fossils that are over 200 million years old in northeastern Arizona.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Prehistoric park filled with the fossils of dozens of extinct species including Australian megafauna.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The world's longest known cave system.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

World's largest collection of serial killer artwork and other macabre exhibits.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.