di John Harrington

Americans love pizza. Several years ago, a Harris Poll, surveying more than 2,000 U.S. adults, found that if those polled could eat only one food for the rest of their lives, 21% of them would choose  pizza – more than any other food by far. (These are the American cities with the most pizza places.)

But it’s not just Americans, of course. Pizza, which originated from humble beginnings as a food for the poor in southern Italy, has become one of the world’s most popular foods, made (in one form or another) and enjoyed in every corner of the globe.