Of use to some, and I'm posting it because it's a rather obscurely located site: "Il sito delle Diocesi d'Italia" which is in fact run by the Diocese of Belluno-Feltre in the Veneto. Portal, well updated as far as I can tell, to dioceses all over Italy, also to Belluno's own parishes. Some of those sites in turn have tourist information on their areas; then of course some of the dioceses vel sim. are of special interest; for example, poke around and you'll find the site of the Abbey of Monte Oliveto in Tuscany, with photos, visiting hours, etc.
The site ties in with the site of the Catholic Church of Italy, which most of you have probably seen; broken URL's at one site can be corrected by those from the other.