Yes, there are numerous paintings and frescoes on the walls of Milan Cathedral. The most notable are the 15th-century frescoes in the apse and presbytery by Donato Bramante, depicting scenes from the life of Christ. Other important works include a painting of St Ambrose with Angels by Simone Peterzano, Giovanni Battista Crespi’s Madonna della Misericordia altarpiece, and a cycle of canvases depicting the Passion of Jesus attributed to Giovan Battista della Cerva.