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. The Shedd Aquarium is a highly-ranked world aquarium and at one time was the largest indoor facility in the world. It is the first inland aquarium with a permanent saltwater fish collection.