Here are some tips for your day trip in Milan
Castello Sforzesco with art museum and a large park, ideal for a stroll.
Piazza Duomo: The Piazza del Duomo and the Duomo di Santa Maria Nascente (Milan Cathedral) are Milan's most famous sights. Milan Cathedral is the fifth largest cathedral in the world and is open to visitors every day from 7:00-19:00, admission is free. However, if you also want to visit the terraces, the baptistery and the treasury, there is an entrance fee.
Cathedral terraces: A highlight that is highly recommended! You can either climb around 250 steps (€13 per person, as of October 2019) or take the lift up to the roof of the church to reach the cathedral terraces. At the top, you can walk around the cathedral once and marvel at the loving details of the famous cathedral, such as the view over Milan. Still a great experience! Tickets are best bought online in advance, which is also recommended to avoid the sometimes very long queues on site.
Leonardo Da Vinci's Last Supper in the small church of Santa Maria delle Grazie, a UNESCO World Heritage Site. This attraction is very popular. So if you want to avoid long queues, it's best to book your ticket in advance. Another must for Da Vinci fans is the Leonardo Da Vinci National Museum, one of the most important technical and scientific museums in the world.