This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A small cell adjacent to this church was once the bedroom for a renowned saint.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

Plaques on its facade commemorate the Tiber's most destructive deluges.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A massive marble foot is tucked away in a small alley near the Pantheon.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This curious, round temple is the oldest still-standing marble building in Rome.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This large, circular tomb is the final resting place of the first emperor of Rome.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

These elaborate gothic monuments honor Verona's medieval lords.

A gorgeous example of 13th-century Gothic architecture.

Not far from the more famous House of Juliet, visitors will find the supposed residence of her lover.