Billy Goat Tavern, established in 1934, is a burger institution in Chicago, known for its double cheeseburger made with thin, all-natural beef patties served on a kaiser-roll bun. The original restaurant — which was a tavern across from the Chicago Stadium — was born when a goat fell off a passing truck and wandered into Greek immigrant William Sianis' tavern. Sianis adopted the goat, grew a goatee, and was nicknamed Billy Goat. This quirky tavern, known for its Cheezborger, is no stranger to famous faces. Its walls are adorned with clips from the Chicago media and pictures from visiting politicians, and it was even parodied on "Saturday Night Live" in 1978.