A 2,000-year-old engineering wonder hides beneath an Italian town.

A 17th-century doorway in a small Sabine village is a portal into the mysteries of alchemy.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

The second-highest village in Lazio has attracted artists for 400 years and is now a spectacular open-air art gallery.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

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

Rome's ancient Etruscan rival, now a park full of ruins.

A spiritual sanctuary in a natural cave.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

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

This medieval settlement was abandoned after a series of landslides. What remained was largely destroyed during a mock battle for a WWII film reel.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

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

Geometry and mystery come together in an epic show of octagonal masonry.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Walk through a fairytale in Tuscany.

A memorial to Brazil's little-known role in World War II.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

Water and windows define this defensive Italian well.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

The construction of a new church near Venosa was started in the 11th century, but never finished.

Once an ancient Roman bath, now a hotbed of geothermal energy and a hub for energetic innovations.