Suggest 1 thing to do in these 7 Midwest cities

[JordanIB]

Going on a baseball trip starting this weekend:

Chicago, Milwaukee, St. Louis, Chicago (again), Cincinnati, Detroit, Cleveland, Pittsburgh -- in that order.

I should have time for 1 touristy-type thing (i.e. going up in the Arch in St. Louis) and one "local" food stop (i.e. gotta try deep dish at this Chicago Pizzaria) in each city. Food can be a place to grab pre- or post-game grub.

If one or more of those cities catches your eye, give me your 1 touristy and 1 food-related "must-haves."