Free Admission Tuesday from 9am to 5pm at Shedd Aquarium - see INFO below. Shedd Aquarium is an indoor public aquarium in Chicago. Opened on May 30, 1930, the 5 million US gal aquarium holds about 32,000 animals and is the third largest aquarium in the Western Hemisphere, after the Georgia Aquarium and Monterey Bay Aquarium. Between public transportation and parking nearby, youll be on your way to Shedd in no time. Let us help you choose the best way to get here. Please note, until further notice, there will only be garage parking on the Museum Campus, no street parking on Solidarity Drive. If you choose to visit Shedd Aquarium, we strongly recommend arriving via public transportation. More Info below.