One of the oldest squares in Milan, strolling through it will give you a feel of how the city used to look like in the olden times. There are several statues and monuments in this square, one of them being devoted to Oldrado da Tresseno, whose idea it was to reconstruct this place in the Middle Ages.
Wikipedia https://en.wikipedia.org/wiki/Piazza_Mercanti
Address 7 Piazza dei Mercanti, Milano 20123, Italy
Coordinates 45°27'52.562" N 9°11'15.615" E