This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A public urinal so pretty, it was declared a national monument.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The attic of a four-century-old canal house hides a clandestine church.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Cat art as far as the eye can see.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

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

The first museum in the world devoted to sexual gadgetry.

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

This charming pup is meant to celebrate the youth and stubbornness of the city's students.

A nearly 25-foot concrete sculpture of Sylvette, Picasso's muse.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

A modern reimagining of a medieval city gate.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.