Well this is a must to visit. Food all around and shopping streets from all sides. And of course the Duomo & Basilica. You can take pics of both from all around this Piazza. Get the tickets to enter the Duomo, Basilica, and a few other Museums form this plaza. Locates to the left of the Basilica. Also I recommend a pizza place by the place were you purchase the tickets. Order the slice with meatball type. You will not be sorry and you won't find this awesome slice of heaven anyplace else.