| Built soon after 1225, besides having on its façade the mayoral coats of arms of Massa, Siena and of some of the captains and Podestas who had been governing there, it also has the big iron bell to which the people who were pilloried were tied up. Still visible today, near the stairs leading to the palace, is a groove where they used to keep a metal measure. Maybe it was the “passo”, made of three “braccia”. This was the official measurement of the Massa’s state. Today the Palace is the seat of the Archaeological Museum and of the Art Gallery where the splendid Maesta’ by Ambrogio Lorenzetti is on show.