Behind the beautiful palaeochristian church of Sant Eustorgio the Museo Diocesano is housed in the old sacresty and the rooms which surround the cloisters. It features 17th and 18th century religious relics and other works of art from the Basilica.
Together with engraved cupboards, relics, (such as the Santa Croce reliquary donated by the Queen of France in the 17th century), sacred items and a few objects from the Paleochristian cemetary discovered under the basilica, there are some significant canvases by Panfilo Nuvolone from the Procaccini and Vermiglio school.
From the museum you can also reach three underlying rooms which constitute the remains of the Roman and Paleochristian cemetary where burial and incineration tombs have been found, a small lapidary and a tomb with edicola.