#3 John's Pizzeria (New York City)
Yes, John's of Bleecker is on the tourist rotation, but there's a reason this place has become such an institution. The pizza is cooked in a coal-fired brick oven, the same way it's been done there since 1929. You can choose from their available toppings (pepperoni, sausage, sliced meatball, garlic, onions, peppers, mushrooms, ricotta, sliced tomato, anchovies, olives, and roasted tomatoes), and you can scratch your name into the walls like the droves before you, but what you can't do is order a slice. Pies only, bud.
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