A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A fascinating insight into daily life in the Eastern Bloc.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

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.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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

No need to strap in for a "ride" on this walkable roller coaster.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This unique Renaissance castle was turned into a home for Nazi occultism.

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

This conical hill was built as a testing ground for an engineer known as the Glider King.

Dolls of all shapes and sizes display the eras of femininity in this spooky and beautiful collection.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

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

Ruins of a German Castle on top of a towering stone pillar.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.