The Aqueduct of Serra do Pilar, located in the Town of Oliveira do Douro, is eighteenth-century building, also known as "Aqueduct Sardão"and was built in 1720 by José Leitão Benedict in order to carry water from a spring in Vilar de Swallow, for his palace of Quinta do Sardão. The aqueduct consists of twenty-three arches full and large, supported by tall pillars of different heights, following the uneven terrain.