Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

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

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

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

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

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

This is the oldest Roman-made bridge in the city still existing in its original state.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A small but very fascinating fountain in the center of Rome with four books and a deer carved.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.