Milan Cathedral (Duomo)

One of the largest churches in the world, a Gothic cathedral that took nearly six centuries to complete, covered with more than 3,000 statues and 135 spires. The highlight is the roof terraces, where you walk among the spires and pinnacles with a view over Milan and, on clear days, the Alps. Take the lift or the stairs.

Next door, the elegant Galleria Vittorio Emanuele II shopping arcade leads to La Scala opera house. Buy tickets online for the terraces; shoulders and knees must be covered inside.