Roman aqueduct of Nîmes

The almost 50-kilometer-long aqueduct was built to transport water from the springs near Ucetia (Uzès) to Nemausus. While construction was long dated to around 19 BC, newer archaeological findings suggest its creation in the mid-1st century AD. After completion, approximately 20,000 cubic meters of water flowed into the city daily, which at the time had about 20,000 inhabitants. About two-thirds of the pipeline ran underground and had to be carved into the rock. Despite a winding route of 50 kilometers to bypass mountain formations, the total elevation difference over this distance is only 12 meters.