The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

Greenery covers the face of a gently-dripping waterfall deep in the mountains of central Sardinia.

This cliff-face port is considered a masterpiece of mining engineering.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

Once one of the largest sites of silver deposits in Italy.

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

This medieval Italian town is a sheer (and beautiful) cliffside defense.

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

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

The glowing blue Nymphaeum of Emperor Tiberius.

This clifftop arch is a natural stunner.

According to the legend, this structure was built in a single night with the help of the devil.

A beautifully well-preserved ancient Roman villa.

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

Beautiful views and Roman-style statues on the Italian coast.

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.

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

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

For centuries, this large Roman villa remained hidden thanks to the eruption that buried nearby Pompeii and Herculaneum.

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

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

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

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