The photo was taken in July, 2017. There are many things to do in Chicago but to visit John Hancock Observatory must be in top three. I had Chicago City Pass, so I did not pay anything separately but the entrance fee is around $20 I guess. It is pretty close to Navy Pier, so after having a nice dinner at Navy Pier, you can visit the observation tower. Actually Chicago has 2 observation towers. I would suggest you to visit John Hancock at night, and Willis Tower during the day. Apart from those, if you visit Chicago some day, do not miss your chance to watch a baseball game! :)
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From @meertcevik