Lonely Planet has a list of 20 great regional sandwiches that is a good place to start for those interested in expanding their meat-and-cheese horizons. Some are a little terrifying (yet intriguing!), like the Horseshoe from Springfield, Illinois, an open-faced sandwich made with two pieces of toasted bread and two hamburger patties piled high with cheese-sauce-smothered French fries.
Others are well-known favorites, like the lobster roll, the po'boy and the Cuban, which fans argue was either invented in Tampa or Key West — or was it Cuba? If it ever comes up, just nod and keep eating; we've found that when it comes to great regional sandwiches, emotions run deep.
→ Check it out: A field guide to 20 great regional sandwiches of the USA at Lonely Planet
Do you have a favorite regional sandwich? Share your recommendations in the comments!