A Roman Aqueduct was like a big tunnel made out of stone that was built over 2,000 years ago to bring fresh water from rivers and mountains to people living in cities. The aqueducts, which were built in a downhill slope, would collect water from the mountain and send it down to the city in an underground network of tunnels and pipes, like a really long and big straw. People in the city could then use the water for drinking, cooking, washing and farming. Aqueducts made it possible for people to have enough fresh water for their everyday needs.