It looks like the only way you can do it is if you get the Chicago City Pass, 49.95 for adults, 39 for children, and it gives you access to 5 chicago attractions including.. "In addition to full access to Shedd Aquarium, CityPass includes the Hancock Observatory, the Field Museum, Adler Planetarium and Astronomy Museum and the Museum of Science and Industry." You have 9 days to use it. I grew up in Chicago, and I know all of these are worth it. btw, if i remember right, the Chicago Art Institute is free at certain times of the year.

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grimaldis