What Are The Best Cities In The World For Pizza?

When I was 18, I got a job working in a local pizzeria as a pizza delivery man.  After hanging around the pizzeria for a while, they started to show me how to make things: chicken wings, subs and pizza.  They even showed me how to make the dough.  I really enjoyed making pizzas.  People in Buffalo really know the art of making good pizza.  That's part of the reason why a lot of national pizza chains have come here and failed over the years.  Our little mom and pop pizzerias are the absolute best.  So what are the best cities in the world for pizza?  Yahoo.com has the answers and the explanations.