A pair of British filmmakers recently found remains of an aqueduct that delivered fresh water to Rome some 1,900 years ago.
The duo found the aqueduct through a concealed door in a ruined chapel in the Italian village of Manziana.
Beyond the subterranean chamber, a 410-foot-long gallery led to the beginning of the aqueduct and a large chamber that had been dedicated to spring nymph gods.
This three-chambered semicircular nymphaeum was converted into a Paleo Christian chapel after 392 A.D.
Read an article about the discovery here.