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.
This aqueduct was one of 11 that fed water to ancient Rome. It originated around Lake Bracciano, 25 miles from the city.
After collecting water from other springs on its way down to the capital, the channel finally reached Janiculum Hill in Rome, providing clean, drinkable water to the Trastevere district.