It's a beautiful cathedral. The murals on the whole wall are very beautiful and vivid. It's worth watching carefully. It's also very lively when there's a sermon Sunday.
St. Maurizo's Church is about ten minutes'walk from the Cathedral of the Central Monastery. It's worth seeing. If you like music, then there are some performances in the evening, you can ask the specific date of the Milan Tourist Bureau, you can also participate in the free half-day tour of Milan, the mid-sixteenth century architecture.