Hmm Secret Library of the Vatican has a website..

“featured” in the film Angels and Demons, though the meaning of secret in this case dose not mean hidden or anything, apparently in this case its a reference to being property of the Pope (http://en.wikipedia.org/wiki/Vatican_Secret_Archives for details on that), 85 Km of shelving in there, wow.

http://www.archiviosegretovaticano.va/?lang=en