Castello Sforzesco is a surprising monument sheltering several specialized museums and traces of the city’s past. An oasis of art and culture. It was originally a Visconti fortress and later home to the mighty Sforzas, the rulers of Milan, who transformed it into a magnificent ducal palace thought to have been decorated by several of the greatest artists of the times including Donato Bramante and Leonardo da Vinci.
Transformed into a military complex during four centuries of foreign occupation and subsequently used as the barracks of the Italian army, at the end of the 19th century the Castle was restored by architect Luca Beltrami who turned it into the headquarters of Milan’s Civic Museums.
Today the Castle sits in all of its glory in the eponymous square with its 70m-tall “Torre del Filarete” and a number of majestic circular keep-towers.
https://www.wheremilan.com/sightseeing-sempione/sforza-castle/