I was particularly thinking of the Aqua Virgo, an aqueduct to Rome that supplies city fountains to this day, and the Cloaca Maxima, a sewer and drainage system

I was particularly thinking of the Aqua Virgo, an aqueduct to Rome that supplies city fountains to this day, and the Cloaca Maxima, a sewer and drainage system that has been in operation since it was built two thousand years ago