Although gentrification is diligently working in making the part of the world you're visiting look like the part of the world you just left, some uniqueness of each region still prevails -- at least as far as sandwiches are concerned. Some look downright scrumptious.
These sandwiches are all iconic somewhere, though they range in national fame from the grilled cheese to the horseshoe (wait, what's a horseshoe?). Many of these we've eaten before; some were new to us. And though we divided them regionally, they can of course be found in any number of cities across the country.