Lived in Italy two years. Most of the stuff in the US on pizza are not found in Italy. My favorite pizza in Italy was pizza quattro stagioni (four seasons).
Pizza quattro stagioni (four seasons pizza) is a variety of pizza in Italian cuisine that is prepared in four sections with diverse ingredients, with each section representing one season of the year. Artichokes represent spring, tomatoes or basil represent summer, mushrooms represent autumn and the ham, prosciutto or olives represent winter.
In Naples they had small clams in their shells in one quarter.
I have had that pie.
I spent just over a month in Naples. There was this little place that made the best pizza. It was very plain, just crust and sauce if I remember right. It was addicting it was so good.