Built in the mid-14th century by Barnabò Visconti, probably one of the most imposing, it was used as a military fortress but also as a summer residence for the lords of Milan. Strange events immediately plagued the construction; the owner himself was poisoned in the prisons beneath the Manor. Conquered in 1402 by the Colleoni family, it was the target of wars and military stratagems: in fact, the bridge was lost in 1416 to heavy catapult fire! During the Sforza period, it was also the subject of one of Leonardo da Vinci's drawings! Today, in a wonderful park inhabited by squirrels and animals of the Adda Nord park, what remains are the tallest Visconti tower in the region, vast underground chambers, and prisons that extend into the bowels of the earth just beneath the ruins of the fortress. It now hosts approximately 30,000 tourists a year.