The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A monument to the man who almost killed Hitler.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

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

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

A Cold War secret surveillance tower used to spy on radio communications.

A quaint Russian village in the middle of a German metropolis.

The final resting place of many of Germany's most famous communists.

Where once there was a train station bathroom, there is now this German burger joint.

Floating swimming pool within a moored vessel.

Started as a kitchen garden, now the second largest botanical garden in the world.

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

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

It's always summer at the beach inside this former airship hangar.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

Unique house covered in a nightmarish mural of demons, ghosts and monsters.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

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

The largest brick bridge in the world.

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

These 17th-century mummies are no longer naturally preserved, but remain on display today.

The mystery of the Putim Ossuary involves a tricorn hat.

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