Must Sees - Chicago?

As I've never been there before, and travel guides aren't as comprehensive as for the likes of NY, SF or LA, does anyone have any must sees for Chicago? Or avoid like the plagues?
Thanks!
Thanks!
For any fans of cheesy 80s US teen movies, you could probably design a whole trip around key locations featured in those movies.
Originally posted by jaguarpig
And the Blues Brothers 'Daley Plaza the one with the Picasso'