A huge enchanting public park just outside the ancient walls of Rome.

Ruins of a 10th century church tucked away deep in a botanical garden.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

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

Crushed coral and crystals give the sand its signature coloration.

This large, circular tomb is the final resting place of the first emperor of Rome.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

A Nesting Doll of Churches.

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

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This 16th-century monastery has been turned into a surrealist architecture compound.

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

An Italian hillside ghost town.

Five candy-colored villages on the Italian Riviera.

A Milanese café entirely designed by the American director Wes Anderson.

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

Geothermal waterfalls in Tuscany.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

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

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Venice's "Island of the Mad."