Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

The first green space constructed on an elevated viaduct.

Rebuilt remains of a temple to Roman god Mithras.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

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