The Pozzo di San Patrizio (English: "St. Patrick's Well") is a historical structure in Orvieto, Umbria, central Italy. It was built by Antonio da Sangallo of Orvieto, between 1527 and 1537, at the behest of Pope Clement VII. The well, designed to provide water in case of disaster or siege, was completed during the papacy of Pope Paul III.Access to the water is provided by two spiral ramps, served by two separate doors, which allowed mules to carry the water along an unobstructed path.The well is 53.15 metres (174.4 ft)[1] deep, cylindrical, with a base diameter of 13 metres (43 ft). There are 248 steps, and 70 windows provide illumination.

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