An extraordinary mechanical calculator designed by the mathematician and philosopher Gottfried Leibniz.

If they push on just the right spot, even the weakest person can move this titanic boulder.

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

This spooky statue sits outside a famous Prague theater.

Take a walk in a recreation of ancient Rome.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

A 12th-century fortress containing some of Berlin's oldest buildings.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

This proud Teutonic warrior rises out of a German forest heralding a victory and measuring lightning.

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

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

This "floating railway" is one of the world's oldest monorail systems.

This painted Lego bridge is the product of over a century of locomotive history.

Be it nature, art, or abandoned military architecture this eclectic German "museum" has you covered.

Twisted buildings adorn the banks of the Rhine river.