The unique geology of Caprarola with the various districts outlined by trenches – that of Mazzocchio to the east and Pilo or St. Teresa in the west – on different levels, forced Vignola to design large bridges. In order to build the bridge of the Nuns above what is now Piazza Sicilia, several houses in the upper part of the Fornella district were destroyed between 1560 and 1563. In Piazza Sicilia you can clearly see the relevant structures of the imposing Castle of Vico, which have been incorporated into the Palazzo Fusaro.