Tynio,
Went to Italy this summer for two weeks. I used a 28-90 and 70-300. Never felt like I needed another lens.
If its Architecture you're looking for, Italy is the place. Incredible. I don't think there's a flat face on any building in the country. If you get a nice Sunday morning, take your camera and a few rolls of film at day break--very few people outside at the tourist areas at that time.
Have a good time