The location where a famous medieval knight was murdered.

A masterpiece of modern architecture that caused quite a stir in Paris, recreated in Bologna half a century later.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

A beloved local artist has been honored with this statue of a man emerging from a toilet.

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

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

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

The monumental home of Prussia’s eccentric "Cannon King."

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

The excellent Swiss museum of witchcraft is led by a modern witch.

CERN's beautiful, bending sculpture is a tribute to the spread of knowledge.

The university library shaped like a giant piece of Swiss cheese.

The Swiss hilltop housed an early 20th-century vegetarian nudist colony.

A rare, flower-shaped example of Brutalist architecture in Switzerland.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Caves famous for the dragon-slaying saint who lived there.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

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.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

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