The Veneranda Fabbrica del Duomo di Milano is a 600-year-old organization that was established to supervise the construction of the Cathedral of Milan. The organization is still active and involved with the maintenance, preservation, and restoration of the cathedral. Its main headquarters are located in the eponymous palace in Piazza del Duomo. Despite the Duomo being a consecrated Roman Catholic church, the Venerable Fabric is completely independent of the Holy See.