France's national museum of scientific and industrial instruments.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

A font of vintage porn on the silver screen.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This massive library holds what was once the largest book collection in the world.

A subterranean shelter remains intact under a busy Paris railway station.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

An antique curios dealer and hybrid taxidermist.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

BDSM, 1930s Style.

A Belle Epoque bordello turned into a themed love hotel.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

The celebrated eyesore created by starry-eyed sweethearts.

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

The oldest stone house in Paris was built by its most famous alchemist.

There is beauty and history in the ruins of this former company town.

This little museum in the town where zombies were born celebrates the living dead.

There are two legends behind the origin of this unusually tall sanitary structure.

A unique attraction and museum dedicated to exploring iconic roadside structures.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

Everyone and everything one man ever loved and lost, now stare into the East for all eternity.

Origin of the blue-skinned Fugates of eastern Kentucky.