Officially known as Museo dell’Opera della Metropolitana founded in 1869 is an essential part of the Siena Cathedral, literally built into the very fabric of the Duomo. The museum hosts works of art testament to Sienese power, ambition to outshine Florence, artistic achievement… And a breath-taking view of Siena! The works include Gothic sculptures by Giovanni Pisano and his school; the Maestà of Duccio di Boninsegna and works by Ambrogio and Pietro Lorenzetti.