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

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

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

The curious underground history of keeping Paris clean.

This Parisian gem is one of the most incredible ethnographic museums in the world.

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

An odd museum dedicated to French fakes.

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

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

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

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

A font of vintage porn on the silver screen.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

What looks like a normal building is really a hollow facade hiding a subway vent.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

A curious collection of locks and keys.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Saintly bones pressed into a wax effigy of a Catholic superstar.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

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