Parco Sempione is a large city park in the historic center of Milan, region of Lombardy, Italy. Established in 1888, and designed by Emilio Alemagna, it has an overall area of 38.6 hectares, and it is located inside the Zone 1 administrative division. The vaguely polygonal park is anchored to the southeast by grounds of the Sforza Castle and a linear axis leads in the northwest to the Arch of Peace.