Why you should experience Piazza del Cannone in Milan, Italy.
Piazza del Cannone is a spacious castle forecourt where Sempione's ducal landscape, military past, nineteenth-century parkmaking and contemporary public culture converge between the rear defenses of Castello Sforzesco and the lawns extending toward Arco della Pace.
Set behind Castello Sforzesco near Viale Gadio and just steps from Parco Sempione, the plaza occupies the threshold where the Visconti and Sforza once maintained an enormous enclosed hunting preserve before centuries of foreign rule reduced the territory behind the fortress to military ground and nineteenth-century Milan transformed the former parade field into a civic park. Emilio Alemagna designed that new landscape between 1890 and 1893 with curving carriage routes, water, varied elevations and English-inspired planting, establishing the long green perspective that now begins immediately beyond the open square. The broad unpaved surface preserves a deliberate visual pause between the castle walls and Alemagna's landscape, with the park opening toward distant monuments instead of pressing vegetation directly against the fortress. The result is a castle forecourt where the transition from fortified ducal territory to military ground and metropolitan park remains legible through one unusually expansive piece of open Central Milan.
What you should know about Piazza del Cannone.
Piazza del Cannone is best known for taking its name from the enormous Austro-Hungarian siege weapon that stood there for decades after World War I. The weapon was a Ε koda 305-millimeter mortar built in 1911 for the Austrian army, part of a class of mobile heavy artillery developed before the conflict and subsequently used against fortified positions during the war. Milan placed the captured piece in front of the castle's Porta del Barco after the fighting ended, and a 1919 image already shows crowds gathered around it. The mortar remained sufficiently dominant in the open ground for the location itself to acquire its present name, outlasting the military object that inspired it. Removal came only near the end of the 1950s, leaving the name attached permanently to a square whose most recognizable physical object had disappeared. That progression from wartime trophy to place name gives the simple open space an origin inseparable from the political consequences of World War I.
A different national drama occupied the square on May 26, 1946, one week before Italians voted on whether to retain the monarchy or establish a republic. Photographer Federico Patellani captured a monarchist demonstration there through an extensive sequence of images showing crowds carrying royal flags, people sheltering beneath umbrellas bearing monarchist emblems and an individual wrapped in the flag itself. The postwar forecourt subsequently developed into a flexible stage for large temporary gatherings, including the carnival fair whose rides continued a Milanese amusement tradition formerly associated with Porta Genova and the Darsena. Parco Sempione hosted a cross-country skiing World Cup sprint event in January 2011 involving 140 athletes, demonstrating how the castle-side territory accommodated international sport as well as civic gatherings. StrΓ Festival later placed street theater, contemporary dance, juggling and a dedicated festival tent across the square, and Design Society occupied it during Milan Design Week in April 2024 with exhibitions, workshops and nightly music programming. A monarchist rally, carnival ground, international sporting setting and design-week venue trace the unusual evolution of an open space repeatedly appropriated for Milan's changing forms of collective performance.
How to fold Piazza del Cannone into your trip.
Piazza del Cannone works as the anchor for a daytime progression through a Renaissance fortress recovered from near demolition, a Napoleonic amphitheater created for mass performance and an Alberto Burri installation that turned the park itself into a theatrical composition.
Begin at Castello Sforzesco, whose first fortress arose under Galeazzo II Visconti between 1360 and 1370 before Francesco Sforza rebuilt the damaged complex after becoming ruler of Milan in 1450. Antonio Averulino, known as Filarete, entered the project in 1452 to design the city-facing facade and central entrance tower before military architect Bartolomeo Gadio assumed control and strengthened the fortress for the artillery age. Centuries as Spanish, Austrian and French barracks left the former court deeply altered, and demolition remained a serious prospect late in the nineteenth century until Luca Beltrami began the campaign that converted it into a cultural institution and reconstructed the Torre del Filarete, inaugurated in 1904. Continue to Arena Civica Gianni Brera, commissioned during Napoleon's reorganization of the castle district and designed by Luigi Canonica with the Roman Circus Maximus as an architectural reference. Work began in 1806 and the amphitheater opened in Napoleon's presence on August 18, 1807, replacing a temporary wooden arena used for annual national celebrations. Milan acquired the structure in 1870, sporting events became prominent around the turn of the twentieth century and the city dedicated it to journalist Gianni Brera in 2002. Conclude at Teatro Continuo di Burri, created by Alberto Burri for the XV Triennale in 1973 as six rotating steel wings mounted on a raised reinforced-concrete platform aligned between the castle and Arco della Pace. Authorities demolished the work without Burri's knowledge in 1989, but the Fondazione Burri initiated its reconstruction for the centenary of his birth, with Tiziano Sarteanesi directing work before the installation returned to Milan on May 23, 2015. The progression moves from Sforza power becoming Beltrami's recovered cultural fortress through Canonica translating Napoleonic performance into permanent architecture into Burri using the castle-to-arch axis as the stage for a work destroyed and rebuilt, revealing three radically different attempts to shape public space around Piazza del Cannone.
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