Only after 1923 did the castle cease to serve an exclusively military function. It underwent a dramatic structural change, following plans by Antonio Avena, director of the Civic Museums, and the architect Ferdinando Forlati: the reconstruction of the swallowtail battlements, the insertion of late Gothic and Renaissance decorative elements in the facades, and extension of the pictorial decoration in “period” style. Beginning in 1925 the castle became a museum, where valuable art collections were installed.