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

This natural "sea of stones" was once used by the Romans as a quarry.

It's said the devil used this mushroom rock as a table for a late-night meal.

A statue dedicated to the antihero of the Nibelung legend.

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

This magnificent church allows travelers along one of Germany's busiest roadways a chance to rest and reflect.

A tiny, intricate model railway system.

This outdoor library provides around-the-clock access to around 7,000 books.

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

World's largest barrel containing an inn.

This bomb was once used as a church after it failed to detonate.

This private museum is packed with 20th-century traffic and technology artifacts.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

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

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

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

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

A larger-than-life monument to the inventor of the Bunsen burner.

A small museum dedicated to the history and design of German packaging.

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

This 18th-century folly is one of Europe's rare "garden mosques."

A kindergarten shaped like a cat with a tail that's a slide.

One of the most well-known city festivals in the world.

A thought-provoking outdoor art installation sits in the seat of German law.