This little-known relic crypt holds stolen parts of a Roman Empress.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

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

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

A unrivaled and rather horrifying collection of wax dermatological models.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

This Parisian café sticks almost exclusively to an ethos of reuse.

This museum houses an imposing skeleton army comprised of creatures great and small.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

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

A museum of magic with a Sadist past.

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

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

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

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

Paris' linguistic guide to the international language of, yes, love.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

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