Sforza Castle

The Castello Sforzesco is Milan's history in one brick square kilometre: the Visconti fortress rebuilt by the mercenary-made-duke Francesco Sforza in the 1450s, decorated by the best CVs in the Renaissance (Leonardo and Bramante both drew salaries here), flattened and rebuilt across French, Spanish and Austrian occupations, and finally handed to the city as a museum complex under its restored Filarete tower. The courtyards are free to wander dawn to dusk — locals cut through on bikes, which tells you the castle succeeded at becoming furniture — and the moat's resident cats run the perimeter.

The ticket buys a federation of museums inside, and two rooms justify it alone. The Sala delle Asse holds Leonardo's ceiling: a painted pergola of sixteen mulberry trees whose branches knot into royal monograms overhead — recovered from whitewash and recently restored, it's the only place you stand inside a decorative scheme he executed. And the Museo della Pietà Rondanini holds Michelangelo's last sculpture, the Pietà he was still carving six days before his death at 88 — deliberately or fatefully unfinished, Christ and Mary dissolving into each other and back into the stone. After the muscular certainty of the David, the frailty here lands hard; the dedicated display hall gives it the silence it needs.

The supporting museums (arms and armour, ancient art with the Trivulzio tapestries, decorative arts, Egyptian collection in the vaults) reward the curious for a full half-day, but the honest core visit is ninety minutes: two masterpiece rooms plus a courtyard wander. Exit through the back gate into Parco Sempione — Milan's Central Park, with the Arco della Pace framed down the avenue — and take the Torre Branca elevator or a Bar Bianco aperitivo if the afternoon stretches. Castle, park and arch make the city's best free-flowing afternoon sequence.