The oldest working mechanical clock in the world.

Famously misunderstood wonder of the ancient world

Cold war icon and onetime "hole" in the iron curtain.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

A surreal statue honoring Prague's favorite literary son.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This automated sculpture of two men peeing will spell out text messages with their micturition.

A mocking tribute to the past and modern leadership of Prague.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Bridge that died in war and was resurected.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

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

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

A whimsical bridge adorned with decorative dragons.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

20,000 pieces in a Frank Gehry-designed building.

This one-time health resort was used by aristocrats around the world.

A tiny church on a man-made island in the Adriatic.