The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

An eerie, derelict amusement park in Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The oldest stone house in Paris was built by its most famous alchemist.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

France's most famous cemetery, with some of its most curious tombs.

Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The remains of a sunken military ship wreck visible through clear water.

An ethereal glowing blue ocean cave in Croatia.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

American soldiers discovered Europe's best one-liner at the end of World War II.

Museum devoted to the artificial language of Esperanto.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

The beautiful baroque library of the Hapsburg empire.

This weekly market in the remote oasis city of Hotan still has the atmosphere of the old Silk Road.

A Chinese mining company has created the world's first cloned village in this perfect recreation of an Austrian town.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

A son-and-daughter meat market, hawked by mom and dad.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

A lush desert oasis in the shape of a narrow crescent.