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

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

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

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

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

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

Blitzkrieg bop your way through Berlin's Ramones Museum.

The prototype for all Nazi concentration camps.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

Super-heavy Nazi architectural experiment.

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

Terrifying derelict military hospital once housed a recuperating Hitler.

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

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

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

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

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

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

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

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

A fascinating insight into daily life in the Eastern Bloc.

A wunderkammer of mysterious objects and stories.

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