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."

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

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

The fairy tale castle of the "fairy-tale king."

An eerie, derelict amusement park in Berlin.

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

This extensive collection of vintage Soviet cars is the only one of its kind in the Caucasus.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

The decaying remains of a once-luxurious Soviet spa town.