Walls, towers and gates Torre e Porta di Cittadella The Tower and the Gate date back to the fourteenth century as part of the City Castle. They were the property of the Visconti, and, at the time, they were also used for reasons of defense and surveillance. The whole system, together with the Castle, passed into the hands of several owners, over the years, who changed its appearance several times. Currently they are in excellent condition so you can easily notice all the medieval structural elements.