A military museum, art park, mausoleum, and architectural oddity all on one fascist's estate.

The astonishing collection of an infamous criminologist.

David Sedaris called it "The greatest shop in the world."

Vast network of air raid tunnels beneath Lombardy's capital.

Abandoned railway line circling the city of Paris.

An antique curios dealer and hybrid taxidermist.

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

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

The curious underground history of keeping Paris clean.

Inside a former cabaret, seven floors of erotic art.

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

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

BDSM, 1930s Style.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

France's national museum of scientific and industrial instruments.

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

The history of radiation is on safe display at the foot of a radiation science laboratory.

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

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