San Gimignano - Streets and Squares Piazza della Cisterna It is regarded as the most famous and beautiful piazza in San Gimignano. Medieval towers and a wall of nobility houses surround it. Bounded by Palazzo dei Cortesi and Torre del Diavolo to the north. It was named after a water cistern located at its Centre. Offers a good view out past the Arco dei Becci passageway. Has a unique layout made in 13th Century.