We visited the National Library (one of several with this name in Italy) on our way to the Officina dei Papiri (see separate review). The Library is a find. You need to show ID in order to get in, and you should probably ask for a map, as the place is a labyrinth of small rooms, large rooms, corridors, hallways, chocked full of old books and old stuff. and most of these rooms, since the Library is housed in a wing of what used to be the Royal Palace, are decorated with delicate frescoes, or filled with intaglio-adorned furniture. My favourite pieces are several world globes dating to 400 years ago or so (see photo). One puzzling aspect of the place is the complete trust placed upon the visitor to not touch and not damage the items. I just hope nobody ever abuses of such trust.
Not mentioned in any tourbook (to my knwoledge) is the fact that in the elevated gardens between the Library and the back of the Royal Palace one can take a quiet and cool break from the hard day of sightseeing, enjoy the snack you had the foresight to pack while sitting in the shade and admiring an iconic view (see photograph) of the Maschio Angioino (castle) across the bustling car traffic.