One of the last active volcanoes on the Eastern seaboard.

A font of vintage porn on the silver screen.

Inside a former cabaret, seven floors of erotic art.

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

The historic Masonic Lodge in which the first-ever female Mason was initiated.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

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

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

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

Noirish green neon marks the location of one of the oldest private detective agencies in France.

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

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.

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

The history of radiation is on safe display at the foot of a radiation science laboratory.

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

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

Indents in the pavement are all that remain from a grisly death machine in Paris.

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A Jenga-style cylindrical tower of books that appears to go on forever.