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

Suffocating dogs was a common spectacle in the fumes of this noxious cave.

A sulfuric hellscape in southern Italy.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

Virgil's many-mouthed gateway to the underworld.

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

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

Ancient, mysterious stone altars are hidden among wild woods in central Italy.

Italian director Pier Paolo Pasolini fell in love with this lonely 13th-century tower while making his most famous film.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The hilltop town of Segni was once home to an ancient Roman colony and garrison.

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

Largest necropolis in the Mediterranean.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

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

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

The city of Palestrina was built around this magnificent terraced sanctuary dedicated to the pagan goddess Fortuna.

This splendid mosaic embodies ancient Rome's fascination with the exotic allure of Egypt.

Caligula's colossal pleasure ships, discovered by Mussolini only to be lost in flames.

Anatomical cabinet holds unexpected treasures.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.