Yes, around twenty and another 6 if you do the tilt out
About $20 to go to the top for the 360° view. And an extra $6 to do the Tilt. But well worth the cost. You can see 4 states from there!
Yes, however I'd recommend to get the city pass if you're traveling to Chicago. I don't have the amount charged for the sky deck but the city pass is $99.99 and include 5 different locations, including museums and buildings
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