This one fresco was the main reason I went to visit this museum and it alone was well worth the visit. Picasso's Guernica has nothing on this amazing scene from 1446.
There was a good selection of sacred art. All was nicely presented - not cluttered - so it was pleasant to view the various objects.
Sadly there were no postcards or books available at the museum. One might hope in the future that arts administrators in Palermo would be able to offer more interpretive materials like books. You're also not allowed to take photos.