I’m going to be taking a trip to Rome later this year and trying to figure out if I need to pick up another lens. Right now I have the Sigma 24-70 f/2.8. Will this lens do it or will I need to get something wider? I plan to take the normal pics of the historical sites and some of the sites over in Vatican City. We also plan on heading down to Pompeii and the Amalfi Coast.

If I can get by with the 24-70 i’d rather do that but if I’ll be frustrated that I can’t get some of the sites can you suggest a lens that doesn’t break the bank?