This seventh-century fortification marked the western border of the Lombard duchy of Spoleto.

This small hermitage is located along an ancient route that connected the Tiber and Rieti valleys.

This enormous sinkhole hides a secret world created from divine wrath.

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

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

Water and windows define this defensive Italian well.

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

The meaning behind this triumphal Roman arch was a mystery until the early 20th century.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

This hermitage celebrates the legend of Emperor Constantine's healing from leprosy.

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

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

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