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

This demon atop the Notre-Dame de Paris looks utterly bored.

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

The narrowest street in Paris.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

An unusual number plate signifies the building's saucy past.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

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

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

BDSM, 1930s Style.

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

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

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

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

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

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A museum of magic with a Sadist past.

A surrealist timepiece by the artist of melting clocks.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.