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

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

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

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

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.

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

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

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

This statue is the only female representation of Rome's "talking statues."

This ancient market is often referred to as the oldest shopping mall in the world.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The first mechanized factory in Spain is also one of the most significant mints in the history of money.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The fragmented remains of a massive public bath connected to the city's water supply.