More than a million lights illuminate Chicago's Lincoln Park Zoo in one of the city's greatest holiday traditions - ZooLights. As guests take in the lights throughout the zoo, they can also visit many of the animal exhibits that stay open into the night. Arts, crafts, and many more holiday-themed activities scatter the zoo in a unique and breathtaking nocturnal setting. Tickets for Zoolights can be bought online, and Monday is a free-entry day. An online reservation is still required, nonetheless, even on free-entry days. There are special shows on specific nights, including opening night and New Year's Eve.