The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This once-majestic, now-abandoned Victorian castle has seen better days.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

A restored historic movie theater is the perfect place for a regional film archive.

Wander among the abandoned ruins of this once-powerful medieval town.

These eight mummies are the best-preserved human remains ever discovered in North America.

The ruins of a medieval monastery named after a type of tree.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

A moody and picturesque riverside ruin overgrown with vegetation.

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

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

This abandoned subway station can still be seen on regular commuter trips.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Wisconsin's most celebrated export gets the royal treatment on I-94.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

Nature's biggest mammal swims in landlocked Oklahoma.