Built for the 1982 World’s Fair, the Sunsphere is a one-of-a-kind structure. The 4th Floor Observation Deck offers a breathtaking 360-degree view stretching from downtown to the Great Smoky Mountains including World’s Fair Park, the Tennessee River and the University of Tennessee Campus. A 1982 World’s Fair timeline, gallery, memorabilia and gift shop await you! THE SUNSPHERE OBSERVATION DECK IS CLOSED ON MONDAYS.