A Jenga-style cylindrical tower of books that appears to go on forever.

This bomb shelter-themed bar has barely changed since it opened.

The ruins of a 19th-century corn mill are haunted by a malevolent cave-dwelling spirit.

An institution that preserves the history of institutionalization.

This tiny island is home to the world's largest colony of Northern gannets.

The red crab exhibits one of the most spectacular migrations on earth, despite manmade obstacles.

This bizarre hotel on historic Route 66 has been plagued by rumors of paranormal activity.

Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.

Dating back to the fourth century, it's the oldest Hindu temple still in use in the Kathmandu Valley.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

America's only nuclear missile silo open to the public.

Hidden under the thick tropical vegetation of a cemetery is the tomb of Columbo Sahib.

A desert that evokes the surreal.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

The largest drain hole in the world.