An old legend circulating in Segovia tells that the Aqueduct was the devil's work.
According to this legend, a young girl who was serving in the house of a wealthy man from the city had to go get fresh water to the river every day. The task to take the pitchers up and down was so hard that on a desperate day she made a pact with the devil and offered him her soul so she didn't have to shoulder this chore.
The devil heard her request and promised to find a solution so she wouldn't have to carry so much water. However, he had to perform this task before sunrise. He could only take the young girl's soul under this condition. According to the legend, the devil worked all night incessantly to built a tall bridge that would allow to carry water to the upper part of the city. However, when there was only one stone left to complete his work, the first ray of dawn appeared and the young girl managed to save her soul.