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

Twisted buildings adorn the banks of the Rhine river.

This futuristic German television spire is actually the world's largest digital clock.

Take a walk in a recreation of ancient Rome.

An industrial relic is now one of Europe's most staggering art spaces.

The world's biggest pet store.

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

No need to strap in for a "ride" on this walkable roller coaster.

Largest illuminated advertisement sign in the world.

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

Old Tudor home moved on thick iron rails to a new spot.

The modern birthplace of Irish freedom.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.