This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The first green space constructed on an elevated viaduct.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

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

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

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

France's national museum of scientific and industrial instruments.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

A haunting collection of the vanished and disappearing natural world.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

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

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

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

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

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

This bridge was constructed from the rubble of the infamous Bastille.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

Notorious artist squat renovated into legal studios.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

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