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

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Secret refuge and museum of the Duke of Florence.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

Super-heavy Nazi architectural experiment.

A slice of central Asia in the middle of Berlin.

The most visited, and possibly most controversial, museum in Germany.

A fascinating insight into daily life in the Eastern Bloc.

Former headquarters of the KGB.

World's largest bell sits on the grounds of the Kremlin in Moscow.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

Hear the quietest sound from across the dome.

The oldest working mechanical clock in the world.

Famously misunderstood wonder of the ancient world

Eighty million natural history specimens call this gargantuan museum home.

Ship-sized kinetic sculptural fantasy.