The Pegões Aqueduct was built to supply water to the Convent of Christ in Tomar from four different springs. It is approximately 6 km long. Its construction began in 1593, during the reign of Philip I of Portugal, under the direction of Filippo Terzi, the chief architect of Portugal, and was completed in 1614 by Pedro Fernando de Torres. The aqueduct has been classified as a National Monument since 1910 and was used until the mid-20th century. — from Wikipedia, edited.