Site of a classic 19th-century physics experiment to prove the earth is rotating.

Notorious artist squat renovated into legal studios.

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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This former steel and coal plant is now a neon-lit industrial fantasia.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

A ruined castle stands atop a hill surrounded by dragon lore.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

Thousands of flowers create enchanting pink tunnels over the city streets.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Largest illuminated advertisement sign in the world.