Located at the very centre of the city, this 17,000 m2 square has an enormous historical importance. You cannot miss it, since it is surrounded by some of the most popular sights of Milan.
Wikipedia https://en.wikipedia.org/wiki/Piazza_del_Duomo,_Milan
Address (Unnamed Road), Milano 20121, Italy
Coordinates 45°27'50.858" N 9°11'26.551" E