The National Painting Gallery in Siena, Italy, known locally as the "Pinacoteca Nazionale," houses one of the world's most important collections of medieval and Renaissance Sienese paintings. It includes two rare paintings by Duccio di Buoninsegna, as well as masterpieces by Simone Martini, Ambrogio Lorenzetti, Il Sodoma and Domenico Beccafumi.