Among the oldest and largest in the world, the Roman Csterns of Fermo were built between the first century. B.C. and the first century. A.D. The 30 rooms that compose them, of equal size with barrel vaulting, extend over an area of 2,200 square meters. Ancient cisterns for the collection of water at the service of the city, were abandoned and forgotten until their partial reuse from the end of the 19th century, and for about a century, as a city aqueduct.