The local legend says that the aqueduct was put there overnight by the devil, because of a young Segovian girl who was so tired of fetching water from the river that she sold her soul to him in exchange. It is Segovia's most emblematic monument (literally: it is the main element of the city's coat of arms) and the most important example of Roman civil engineering in Spain, it was built to bring water from the Rio Frio high in the sierra.