Parco degli Acquedotti is a field of open grass with Roman aqueducts running across it. Six of the eleven aqueducts that watered ancient Rome ran through this ground, and a seventh, papal one joined them. The tall broken arches are the Aqua Claudia, finished under the emperor Claudius in 52 AD and carrying a second line, the Anio Novus, stacked on top of the first. Lower down, three older channels were built one above another on a single wall. The oldest of all runs underground and shows nothing at the surface.
The line that still carries water is the newest. In 1585 a pope set out to bring water back to the hills of a shrunken city, and the Acqua Felice was finished two years later, partly on reused Roman arches. So the arches you photograph are dry and the modest ones beside them are working. There is nothing else here: no gate, no ticket office, no café. Sheep graze between the piers, Roman families walk dogs, and the shell of a farmhouse stands in the middle of it. Postwar directors came here to film the edge of the city, and it still looks like the edge of the city.