The Free Water Aqueduct supplied the entire city with fresh drinking water when it was built in 1744. It was built during the reign of John V (João V) who was responsible for many impressive buildings. It is designed in Baroque and Classical style and is more than 14 km long, and the most part is Visible from this magnificent structure is the section of Alcantara that crosses the entire valley, and it is worth noting that many architects were involved in the construction of this structure, which continued to function until 1968.