In the 1940s, Italian architect Mario Cavallè built a dozen of these round homes in northern Milan.

A colossal aqueduct from the second century B.C., deeply hidden in a gorge on the outskirts of Rome.

A semi-abandoned village destroyed by U.S. bombings during World War II dominates the valley of Turano.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

Featuring the last fully walkable parapet walkway in Europe.

This network of roads is one of the most unique Etruscan creations ever discovered.

This small Milan street is filled with colorful homes and a rich history.

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

Windblown rock formations in an ancient Roman quarry.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

The mountaintop inspiration for Umberto Eco's "The Name of the Rose."

Mysterious tombstones thought to be remnants of Atlantis.

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

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

A tree that defies gravity grows in an ancient ruin.

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.

The pristine waters crossing this forest form a hidden waterfall among the dense vegetation.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

A fascist-era rural village abandoned since the early 1980s.