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Accordingly, on 12 May, 1731, the King of Portugal ordered the beginning of the Águas Livres Aqueduct construction.

The building of this public work took on special significance for the Municipal Council and for the people of Lisbon, since they were both called upon to bear the brunt of the costs of this work.

However, scientists from the Paleochronology Group, who perform research relating to “anomalies of science”, maintain that dinosaurs did not die out millions of years ago and that there is substantial evidence that they were still alive as recently as 23,000 years ago.The section at the surface that is most eye-catching and impressive is the stretch that crosses over the valley of the Ribeira de Alcântara, in Lisbon, standing on a row of different-sized pointed arches.The dimensions of the area that this section crosses did not leave much room for adopting a different technical solution.The idea of capturing the free waters (Águas Livres) for the aqueduct dates back to the time when there was an insufficient water supply within the city of Lisbon, particularly in the western area, in Bairro Alto, where the problem was further exacerbated by the urban growth that took place in the late sixteenth century.This situation became even worse in the reign of Dom João V.It is a hydraulic structure that stretches over 36 miles, built of cut stone quarried in the Lisbon area, together with limestone masonry.It was the last great classical aqueduct to be built all over the world, constituting a system for the capture and transport of water, which passes through five separate municipalities in Portugal: Amadora, Lisboa, Odivelas, Oeiras and Sintra.In order to underline the singularity of this work, it is essential to mention that the construction of this aqueduct displays architectural and structural solutions that were highly innovative for its time, as, for example, the construction of galleries with a height adapted to the human scale, a feature that, on the one hand, facilitated its maintenance, while, on the other hand, made it possible to undertake building and repair works inside the gallery without needing to interrupt the supply of water.The Águas Livres Aqueduct is composed of various sections at the surface which, most of the time, follow the route taken by the former Roman aqueduct.The visible stretches of the aqueduct display a structure built of limestone blocks, with rows of regular and even-sized cut stones, designed to support the water conduits, which, in turn, are protected by walls of stone pitching with filled joints, with a round, flat or angular roof, interrupted by vents or skylights, when the structure runs underground.These vents or skylights provide the lighting for the water conduits and head race tunnels, as well as ensuring that they are supplied with oxygen, in order to guarantee the safe quality of the water and to allow for the continued presence there of human beings to clean the gutters and supervise the structure., in Lisbon, these vents or skylights are more elaborate, displaying erudite architectural elements, such as pilasters and pediments.