This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Heralded as one of the prettiest castles in all of Czechia.

No one knows the origin of this creepy little stone man with an oversized phallus.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.

The resting place for anonymous victims of the Danube's dark waters.

The first modernist church in Europe.

Designed as a reminder of one of the darkest moments in Austrian history.

The final resting place for the remains of 143 Habsburg royalty.

Museum devoted to the artificial language of Esperanto.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Op-art architecture designed for happiness.

This museum is dedicated to the little known ancient Roman history of Vienna.

A spherical "micro-nation" in the heart of Vienna.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

A three-shelf library serves as a memorial in the Jewish cemetery of Krems.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This renaissance château was home to an infamous witch hunter who sent a hundred suspected witches to their deaths.

This copy of the famous Prague Astronomical Clock is the result of one man's passion project.

This almost a century old piece of architecture had been overlooked by most, except for the drunk and the homeless

The world's largest collection of intentionally useless inventions.