Walk through Czech history in Prague's largest graveyard.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Countless grotesque faces stare out from this eerie Prague art wall.

Two stunning 17th-century libraries and a cabinet of curiosities.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A slice of central Asia in the middle of Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

At a museum of everyday objects, it is the act of collecting that is really on display.

By night, this auto repair shop turns into a taquería serving up some of the city's finest al pastor tacos.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

An 18th-century battery complete with original kitchen and garrison.

The world's first crowdfunded skyscraper has not gone quite to plan.

This maximum-security prison was abandoned to make way for a national park.

The world's largest ecosystem of its kind is home to South America's only native species of bear.

A narrow ghost town built onto a peninsula behind a Colombian Slum.

Home to 23 voluptuous and instantly lovable sculptures by one of Latin America's most celebrated artists.

The enormous appendage offers spectacular views of Colombia's Huila Department.

The centuries-old trees are draped with Spanish moss to make them look like wizened elders.

The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

A magical world of elves and fairies tucked amongst the trees in Colombia.

Cathedral carved out of salt, located a mile below the earth's surface.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.