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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The celebrated eyesore created by starry-eyed sweethearts.

Notorious artist squat renovated into legal studios.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Museum dedicated to the terror regimes of Hungary.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A Hungarian pharmacy museum with a box full of mummy powder.

Old Danish castle immortalized in Shakespeare's Hamlet.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Inside a former cabaret, seven floors of erotic art.

A collection of noses tucked inside an art museum reveals how times have changed.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

The second oldest anatomical theater is housed in a museum of curiosities.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

This chimerical bridge/tunnel appears to dead end right into the sea.

The natural history museum displaying the British bird collections and dioramas of Edward Booth, free of charge.

Cold war icon and onetime "hole" in the iron curtain.

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