This isn’t strictly about public space, but I simply loved seeing all the ceramic pipes around Pompeii. Most of the ones I saw were exposed in the walls of the houses, but some of them were drainage pipes. There was also the rare lead pipe along the side of the road.
So neat to see these early sanitation and water delivery systems. Of course, water was available all over the city (and modern Italian cities!) at public fountains. I approve!
I am unclear how much of this was a civic undertaking and how much was organized by individual households when they were building their houses. How much civic involvement was there when a house built a drainage channel out into the street? What about water supply?