A long-buried ancient ruin unearthed right in the middle of the city.

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

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

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

Locals pay their respects at a shrine to soccer player Diego Maradona—which claims to contain a real lock of his hair.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

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

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

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

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

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.

Ancient ruins hidden underneath a modern luxury hotel.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

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

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

If you ever wanted to touch a medieval mercenary’s three testicles, look no further.