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Open 365 days a year and is FREE every day. A world of wildlife in the shadow of skyscrapers. Located within a verdant park just minutes north of Chicago, the zoo has been a natural, free oasis for generations of animal lovers, who come to hear a lion’s roar echo off nearby apartment buildings, see gorillas climb trees as the Sears Tower looms in the distance, or forget where they are as they immerse themselves in tropical rainforests, dry-thorn forests or spacious savannas.