Question

The system of water pipes and bridges used to bring water to Roman cities

Answer 1

Those were Roman aqueducts (Latin: aquaeductus) — engineered systems of channels, pipes and arched bridges that carried fresh water by gravity from springs and rivers into cities. They used masonry conduits, lead or terracotta pipes, settling tanks, siphons and monumental bridge-like arcades (e.g., Pont du Gard, Aqua Claudia) to supply public fountains, baths and private houses.