The museum displays works of sacred art from the Ales cathedral chapter and the parishes of the Sardinian diocese. The intention of the exhibition layout is to provide the visitor, albeit in a schematic manner, with an awareness of the history of this area and the diocese. It is, therefore, an invitation to discover one's own territorial identity within a journey of faith.
The cathedral's rich collection of silverware, dating from the mid-16th to the end of the 20th century, provides an insight into the taste, influences and techniques used by master silversmiths in the creation of monstrances, crosses, chalices, patens and other furnishings. The vast collection of vestments, such as chasubles, copes and crushes, highlights the variety of fine and finely worked fabrics such as damasks, silks and brocades. The 17th-20th century wooden and pictorial sculptures belonging to the diocese are an expression of faith and popular devotion, but also of the artistry and ingenuity of local craftsmen. The exhibits are documented by the rich repertoire in the historical archive of the diocese on the ground floor of the same building.