"The simple pizza by the slice at Forno Campo de' Fiori—a bustling bakery in a crowded central piazza—is a thing of beauty. The staff can slice small pieces for you so you can try more than one topping; don't miss pizza rossa (flatbread brushed with tomato sauce), pizza bianca (flatbread seasoned with salt and olive oil), and fior di zucca (zucchini flower, anchovy, and mozzarella). Note that the service isn't particularly happy, helpful, or welcoming, but who has time for pleasantries when you're slammed all day?" - Maresa Manara, Katie Parla