In the second century B.C., Rome built an aqueduct in today’s Spain: the Segovia aqueduct, which provided water to the city until 1973; thus, for two millennia, it fulfilled its purpose.
This imposing work did not use mortar to join the granite ashlars that make it up, and the stones are kept superimposed by a balance of forces.
It has a height of 20 meters and a width of 5.1 m; its total length is 794 m, and a slope of one degree.
It begins in the mountains, at the Fuenfría spring; it reaches the city of Segovia and ends at the rocky promontory where the Alcázar de Segovia is located, one of the most famous medieval castles in the world.
You can consult the following sources to learn more about the topic:
Sarralde, J. L. (2 de julio de 2021). Curiosidades del acueducto romano de Segovia y su historia. Recuperado de https://guias-viajar.com
Wikipedia. (s.f.). Acueducto de Segovia. Recuperado de https://es.wikipedia.org