Lucky You in Wonderful Chicago! And that architecture tour is awesome. They have several of them, if you have time it is a must see! Have a great time Steph!
Man I would like to visit Chicago again. I visited it about 7 years ago on a family vacation to Yellowstone and Glacier National Parks. We only had time to be there for a little more than half the day. Just got to see the science museum and Navy Pier.