No one really knows when the Aqueduct of Segovia, Spain was constructed, but researchers estimate it to have been built around the late-1st Century AD and the early years of the 2nd Century by the Romans, when Segovia was a military base. The aqueduct would supply the town with water from mountains 11 miles (17km) away. It was actively used until the 19th Century, but impressively, it can still carry a stream of water.
July 2009. (0045)