 A total of 35 arches cross the valley, covering 941 m. The tallest arches reach a height of 65 m, and many are pointed, reminiscent of arches in Gothic style.It is considered a masterpiece of engineering in the Baroque period.In 1748, although the project was still unfinished, the aqueduct finally started to bring water to the city of Lisbon, a fact celebrated in a commemorative arch built in the Amoreiras neighbourhood.