Pozzo di S. Patrizio, Renaissance water well in Orvieto, Italy.
Pozzo di S. Patrizio is a cylindrical Renaissance well in Orvieto that descends 54 meters into volcanic tuff and is accessed through two separate helical staircases. The structure includes 248 steps in total and 72 windows that provide light and emphasize the architecture of the two independent stairways.
Pope Clement VII commissioned architect Antonio da Sangallo the Younger in 1527 to build this well, ensuring a secure water supply during his refuge in Orvieto. Work continued until 1537, creating an example of Renaissance military engineering.
The name comes from the legend of Saint Patrick, whose Irish cave was believed to be an entrance to purgatory and equally deep. This symbolic connection is reflected in the well's impressive depth, which locals have long regarded with respect.
Both stairways are well lit and offer views through the windows at several points, while the interior remains cool even in summer. The full circuit takes about 30 minutes and requires reasonable fitness for the descent and subsequent climb back up.
The separate stairway system allowed donkeys to descend and ascend simultaneously without crossing paths: one staircase carried empty vessels down, the other brought full ones up. This thoughtful design prevented congestion and greatly accelerated water supply during potential sieges.
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