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

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

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

A tiny chapel clings to a precipice above Germany’s gemstone capital.

This Cold War–era fallout shelter was actually a storage facility for the nation's emergency currency.

The highest cold-water geyser in the world.

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

This German bone house contains the remains of some 20,000 souls.

A former Nazi lookout tower with a magnificent view of the Rhineland.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

This tremendous timepiece was once the largest cuckoo clock in the world.

1898 German railroad depot museum with working engines, steam train excursions, and hands-on displays.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

After years of being casually peed on by humans, this tree is peeing back.

This museum explores the history of the city's public transportation. Its collection includes the world's oldest preserved electric trolley car.