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

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

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

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

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

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

These hut foundations are believed to be the residence of Romulus, founder of Rome.

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

A rather vulgar example of the transition from Latin to the Italian vernacular.

A Nesting Doll of Churches.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

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

Breathtaking and huge 430 year old maps of Italy.

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

This medieval city gate is now a blend of the past and the modern world.

Pompeii's less famous neighbor is still revealing her secrets.

Richard Luke Concanen never set foot on American soil.

The sacristy of this church contains remains and relics of members of the Aragonese royal family.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

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

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A special area of the National Archaeological Museum of Naples is located inside a metro station.