Super-heavy Nazi architectural experiment.

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

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

An intricate and amazing house built by architect Karl Junker.

"The most colorful grottoes of the world.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A wunderkammer of mysterious objects and stories.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

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

A surreal museum of extraordinary industrial objects.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

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

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

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

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

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

An eerie, derelict amusement park in Berlin.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Paris' fabled purveyor of exotic taxidermy and natural history curios.