Even if you have no plans of entering the Planetarium, go to Adlers when you are in Chicago! It was so fun to see the city from that angle. There was plenty of (paid) street parking the times I went there.
My kid absolutely refused to believe that Lake Michigan is a lake. Back in Denmark, we can look across the ocean to Sweden, so how can this endless span of water be a lake??
I guess I like contrasts. In the summer I post Christmas lights and in the dark of winter (and it is indeed dark and dreary where I am) I post green trees.
As a teenager I visited London often. What impressed me the most (apart from the Topshop under Oxford Circus with their own radio station and clothes we would not see in Denmark for another year) was the Planetarium. So, of course, I had to visit the one in Chicago.