Valletta’s outdoor theatre stands within the ruins of a 19th-century opera house.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

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

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

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

Fortified medieval tower house with lovely roof garden.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Erotic art covers the walls of the largest ancient pleasure palace.

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