Meet your guide and tour group in the Piazza Duomo, behind the cathedral. Your guide is a member of the Veneranda Fabbrica, an organization that has been in charge of the cathedral's preservation and restoration for the past six hundred years.
Don your radio headset to ensure you hear your guide clearly, then proceed past the crowds and enter the Archaeological Area, underneath the church itself. Examine the ruins of the Baptistery of St. John and the Church of Santa Tecla, built in the 4th century. This example of an octagonal Christian Baptistery tells the story of Milan during the Roman age. It was demolished in the Medieval Age to make room for the Cathedral and the ruins were discovered in the 1960s.
Proceed inside to the Cathedral itself, one of the largest churches in the world and an example of the Gothic style. Admire artwork in styles from Modern, Baroque, Renaissance and Medieval, as well as 55 stained glass windows and 3400 statues.
Ride the lift up to the roof terraces, where you can snap photos of the decorative sculptures and roof spires. Climb fifty steps further to the highest terrace, which gives views of the main church spire and a golden statue of the Virgin Mary. Admire views over Milan and, on a clear day, the looming Alps in the distance.