Start your day by visiting the iconic Duomo di Milano, the largest cathedral in Italy. Then, head to the Galleria Vittorio Emanuele II, one of the world's oldest shopping malls, to admire its stunning architecture and do some shopping. In the afternoon, visit the Sforza Castle, a medieval fortress that now houses several museums and art collections. End your day with a stroll through the Brera district, known for its charming streets and art galleries.