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

A forgotten "city of water" underneath the famous Trevi district.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

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

This 17th-century passageway is home to numerous bookshops, a witch legend, and the oldest pizzeria in the world.

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

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

This magical-looking island is notorious for the misfortunes suffered by its owners.

For decades, vendors have sold clothes once worn by American soldiers who stormed Italy in the 1940s.

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

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

The walls and streets of the ancient city are peppered with penises.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

This tiny islet has somehow housed an ancient temple, two monasteries, a church, a fortress, and a restaurant.

A limestone grotto where daylight filters in from below and turns the water a beautiful turquoise. Also home to a small underwater nativity scene.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

This clifftop arch is a natural stunner.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

The glowing blue Nymphaeum of Emperor Tiberius.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.