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

This professional clown's home is an outsider art wonderland.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A museum of carnival attractions where you are invited to ride the rides.

Inside a former cabaret, seven floors of erotic art.

France's most famous cemetery, with some of its most curious tombs.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

France's national museum of scientific and industrial instruments.

Weird wax anatomical models reside here, as do other anatomical specimens.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

This demon atop the Notre-Dame de Paris looks utterly bored.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

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

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A surreal museum of extraordinary industrial objects.