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

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

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

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

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

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

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

A large replica of a monumental Roman inscription is located on the side of this museum.

The Pope’s secret escape route.

Breathtaking and huge 430 year old maps of Italy.

These spartan apartments are provided to clergymen visiting Vatican City.

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

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

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

Harlequin costumes, signed scripts, and armor-wearing puppets.

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

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

Hawaii’s largest cemetery rests inside an extinct volcano crater.