There are many notable decorative sculptural works which include the carved wooden choir stalls, the marble altar frontals and the bronze candelabra by Annibale Fontana. Also notable is the high altar from the late 16th century. The crypt sacristy contains, among other treasures, a triptych in ivory and hippopotamus' ivory by Baldassarre degli Embriachi, donated by Gian Galeazzo Visconti. The New Sacristy contains a vivid cycle of frescoes by the Sorri brothers, belonging to the late Sienese Mannerism. The walls have paintings by Francesco Cairo, Camillo Procaccini, il Passignano and Giulio Cesare Procaccini, while the altarpiece of 1524 was begun by Andrea Solario, later completed by Bernardino Campi. Also notable is the refectory, initially used as church during the construction, which has maintained a fresco with the "Last Supper" by Ottavio Semino, 1567 and, in the vault, a "Madonna with Child" and "Prophets" by Bergognone. In the "Foresteria" or "Palazzo Ducale", built in the 17th century by Francesco Maria Richini, are frescoes and paintings by Vincenzo and Bernardino Campi, Bartolomeo Montagna, Bergognone and Bernardino Luini.