Some great Central Illinois burgers:
Gross' Burgers, South of Danville
Super thin patties with crispy edges. Always hot off the grill. Meat is ground in house daily.
Mike's Grill, South of Danville
Virtually across the street from Gross', old timey drive-in diner. Simple, greasy smash burger. Cheese is always perfectly melted.
Moon Glo, East of Danville
Near the Indiana state line, seemingly in the middle of nowhere. No frills, cash only bar with some seriously beefy burgers. Not uncommon to see people eat them with fork and knife.
Green Gables, North of Bloomington
Maybe my favorite on the list. Tiny bar and grill connected to a small general store and bait shop near Lake Bloomington. Simple smash burgers. The magic was all the baked on flavor from the flat top grill that was there forever. Was a staple for something like 80 years before it burned down last year.
Joe's Pub, Bloomington
Another smash burger (I have a type). Tastes like it's been drenched in butter. Eating more than a couple, while tempting, is probably harmful.