The celebrated eyesore created by starry-eyed sweethearts.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Paris' linguistic guide to the international language of, yes, love.

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

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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

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

A church of bones, decorated with 40,000 human skeletons.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

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

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

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

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

Macabre astrological automaton clock dating to the late 1400s.

Ancient snack bar of the Roman Empire re-opened.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

Europe’s oldest natural human mummy.

This clifftop arch is a natural stunner.