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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

https://en.wikipedia.org/wiki/List_of_aqueducts_in_the_Roman...

Start by expanding the countries in your search.

At its peak, the roman empire covered Europe, North Africa, and parts of Eurasia.

In Spain the most famous is the one in Segovia, it is incredibly well conserved, but not in actual use.

Why Italy? There are (inactive) roman aqueducts as far away as Israel