While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

The prototype for all Nazi concentration camps.

Ruins of an aerial tramway that ran for only eight years.

Fantastic views and thousands of love locks.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

A striking 12th-century-style castle built on the edge of a cliff.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

The jaw of one of humankind's earliest ancestors on display at an overlooked geology museum.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

It's good luck to be mocked by this monkey.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A preserved college lock-up that recalls a clubhouse approach to discipline.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

World's largest barrel containing an inn.

Legendary site where an evil bishop was devoured by rodents.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

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

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This supermarket offers shoppers a window into the past alongside their groceries.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.