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

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

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

These 18th century gardens tell a rocky story of the son of Odysseus.

Living trees form the structure of an open-air palace.

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

This historic stone bridge has an entire neighborhood clinging to its sides.

A small but immensely extravagant palace built by the "Night King."

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

An intricate and amazing house built by architect Karl Junker.

"The most colorful grottoes of the world.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

When the rain falls, this drain system turns into a musical instrument.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

A stairway to heaven, or to nowhere at all.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.