One of the oldest masonic museums in Paris.

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

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

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

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

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

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The largest and most famous wax anatomical collection anywhere in the world.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

An alchemist's "magic door" stands in the middle of a Roman park.