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Grangèla is an ancient hydraulic work maybe of Hellenistic period, belonged to polis structure. It’s a kind of deep, filtering well dug into rock. The interior consists of a rectangular compartment, at the bottom of which open three cavities where the water is collected in a tank. The supply of the well, which is still functioning, is also allowed by the grain of clay, present along the connecting tunnel of Via Marconi, which filtered rainwater and subsoil water.
Water was drawn from the hole in Via Santa Maria or from three openings located on the way down of the well that now, through a staircase, allows to go deeper.
Over centuries, Grangèla has been the object of popular beliefs: place of a mysterious and imaginative treasure (which was nothing more than water); center of worship or (in the 16th century) tank for Jewish women purification.