The virtual city guides at Foursquare have just released the results of a deep (dish) dive into America's most distinctive pizza toppings in 39 major U.S. cities. While New York is probably the best place to get a slice you need to fold in half to fit in your mouth, it's also home to truffle-topped pies. In the mood for a killer pizza roll that doesn't come from your supermarket's freezer section? Head to San Diego. You can check out the rest of their gastronomic travel guide below.

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