At the intersection of Clark and Ontario Streets in Chicago sits the biggest Mac shack I've ever seen, and one of the best. It's actually a museum as well with some interesting pictures and memorabilia all over. On the first floor is the regular food area and there is a second floor where they serve gelato. Gelato at a Mac Donald's is pretty cool. Almost as cool as getting a beer in the London locations. The view from the second floor is good. Check it out when you're in town.