Built within ten years between 1358 and 1368 under Galeazzo II Visconti, the castle was partly destroyed in 1447 because of a decision of the Ambrosia Republic. It was rebuilt during Francesco Sforza’s period. Until 1880, the castle suffered many adversities when the government wanted to destroy it. The good sense prevailed and the castle was restored under Luca Beltrami’s direction. The entrance is situated under the tower of Filarete; on the back you will find the Bona di Savoia tower and on the left side the Rocchetta, a fortified burnside at one side of the castle useful to get refuge during war attacks. One of the rooms of Ducal Court, the “Sala delle Asse” is thought to have been frescoed by Leonardo da Vinci.