Urban archaeologists in Naples have used 3D laser scanning to map a vast subterranean Roman aqueduct system that spans several kilometers beneath the modern city. The Aqua Augusta, as it was known, served as the primary water supply for the Bay of Naples during the 1st century CE.
The survey revealed intact hydraulic valves and lead piping that demonstrate the sophisticated engineering of Roman water management. Parts of the system are remarkably preserved, featuring vaulted ceilings and waterproof opus signinum plaster.