In contrast to the Field Museum which felt old and tired, the Shedd Aquarium was full of life. The museum was vibrant, there were tons of people hanging around, and the exhibits were cool. We watched the dolphin show which was a little tedious and depressing (although required if you have children) - it's the only thing I'd recommend you consider skipping. I've only been to a few aquariums in the US - this is one of the best ones I've seen.
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