The national museum, opened in 1893, stands among the ruins of the Matildic castle in a building adjacent to the old castle walls.
The "Naborre Campanini" museum displays artifacts from excavations of the castle carried out in the last decades of the 19th century and first desired by archaeologist priest Don Gaetano Chierici.
The initial material was brought together by Naborre Campanini, after whom the institution is named. It collects evidence found during excavations carried out in the second half of the 19th century. Some of the material comes from the nearby church of Sant'Apollonio, which was partially demolished by a landslide in the 14th century. On display are documentation on the castle's history, architectural fragments, Romanesque capitals, epigraphic fragments, stone and brick materials, ceramics, a baptismal font, and matildic relics.
Canossa Castle and the Naborre Campanini National Museum are open Tuesday through Sunday from 10 a.m. to 6 p.m. (summer hours). Reservations are required for groups.