Parco Sempione is Milan's most visited public park, covering 38.6 hectares in the city's historic centre directly behind the 15th-century Castello Sforzesco. The site was not always a park: for centuries it formed part of the ducal hunting grounds and military exercise fields attached to the Sforza fortress. Only after Italian unification, as Milan underwent rapid industrial expansion, did city authorities commission a proper public green space. Landscape architect Emilio Alemagna designed the park in the English romantic tradition — characterised by curved, naturalistic pathways, open meadows, and irregular water features rather than the rigid symmetry of French formal gardens — and the park opened to the public in 1888, immediately becoming a gathering place for Milanese of all classes.
The park contains several architecturally and historically significant structures. The Arco della Pace (Arch of Peace), positioned at the park's northwestern edge on Corso Sempione, was designed by Luigi Cagnola and completed in 1838 to celebrate the Napoleonic era — though its dedication was hastily revised to honour the Restoration after Napoleon's fall. Inside the park grounds stands the Torre Branca, a slender 108.6-metre steel tower designed by Gio Ponti and built in just three months for the 1933 Triennale di Milano; it remains one of the most striking examples of Italian rationalist design in the city. The Acquario Civico di Milano (Civic Aquarium), also bordering the park, dates to 1906 and is one of the oldest aquariums in Europe still in operation. The small artificial lake at the park's centre, traversed by a picturesque stone bridge, was conceived by Alemagna as a central scenic feature of the English landscape composition.
Visitors today find the park functioning as a genuine social crossroads. On any given afternoon, the meadows host students from the nearby Università Cattolica, families with children at the playgrounds, joggers circling the lake path, and chess players gathered on the benches near the Arco della Pace. The park also hosts cultural events tied to the annual Triennale di Milano exhibition, whose pavilion sits directly adjacent to the park's eastern edge. The Triennale's outdoor terrace overlooks the park's tree canopy, offering an architectural counterpoint to the greenery below.
Parco Sempione is open daily, with hours varying seasonally — generally from 6:30 a.m. to around 9:00 p.m. in summer and closing earlier in winter. Entrance is free. The nearest metro stop is Cadorna (Lines M1 and M2) or Cairoli (Line M1), both a short walk away. The park is most atmospheric in the early morning before crowds arrive, or at dusk when the Castello Sforzesco's towers are lit and reflect in the lake. Picnicking on the lawns is common and accepted; several kiosks inside the park sell drinks and light food.
