Milan Cathedral, or the Duomo, is located at Piazza del Duomo. The gothic-style building took over 600 years to complete, with construction starting in 1386. There are beautiful stained-glass windows and inside you’ll see a wide range of impressive works of art. A museum on-site features wooden models, tapestries, statues, and other items, many of which were materials used to build the cathedral. Head to the roof for an awe-inspiring view of the Alps through the marble spires and pinnacles of the cathedral.