The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

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

Statue of death tucked in the University of Medicine courtyard.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

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

The last bastion of Roman presence north of the Alps looms over a German town.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

Budapest's Communist-era statues, banished to the suburbs.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

A fake Transylvanian castle houses a cathedral of antlers.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A Hungarian optometrist's charming collection of Asian art and curiosities.

Once the home of a hermetic monk, this cave now houses a small church.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

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

The topiary maze at the Habsburg hunting lodge.

A history of heat is on display at this unique Austrian museum.

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

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