English: Pozzo San Patrizio, well built on the orders of the pope. During the Sack of Rome in 1527 the Pope took refuge at Orvieto, and fearing that in the event of siege by Charles' troops the city's water might prove insufficient, he had this spectacular well constructed by the architect-engineer Antonio da Sangallo the Younger (1527‑37) with double helical ramps for one-way traffic, so that mules laden with water-jars might pass down then up again unobstructed. Its inscription boasts QUOD NATURA MUNIMENTO INVIDERAT INDUSTRIA ADIECIT ("what nature stinted for provision, let application supply").