Aqueduct of Águas Livres – Museu da Água
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Commissioned in 1731 by John V of Portugal, this aqueduct was Lisbon’s first regular water supply system. It spans a total of 58 kilometres and withstood the 1755 earthquake. This monument demonstrates how the water was distributed along the city and remains one of the most iconic elements of Lisbon. The Alcântara Valley crossing is made up of 35 monumental arches over an extension of 941 meters, with the largest arch in stone measuring 65 meters high and 32 meters wide. The aqueduct was disconnected from the water system in 1967, but it stands as one of the most remarkable works of hydraulic engineering in the world.