There are many famous pizzerias in Naples where these traditional pizzas can be found such as Da Michele, Port'Alba, Brandi, Di Matteo, Sorbillo, Trianon, and Umberto. Most of them are in the ancient historical center of Naples. These pizzerias follow even stricter standards than the specified rules by, for example, using only San Marzano tomatoes grown on the slopes of Mount Vesuvius and drizzling the olive oil and adding tomato topping in only a clockwise direction.