The museum is the continuation of the Treasury of the New Bavo, which existed from 1973 to 2009, and was located in the relatively small Episcopal Sacristy.
The collection of the museum contains special art treasures such as paintings, sculptures, banners and liturgical silverware. A special part of this is formed by inventory items from the chapel room of King Louis Napoleon as it was once decorated in the Royal Palace on Dam Square in Amsterdam. A number of special liturgical robes from the Middle Ages and later, with embroidered biblical scenes on it, are permanently displayed in high showcases in the choir aisle. In addition, the museum offers models and other material to explain the construction and decoration of the Nieuwe Bavo.