https://www.visitknoxville.com/sunsphere-tickets/

The Sunsphere, built for the 1982 World’s Fair, offers a unique experience. Its 4th Floor Observation Deck provides a stunning 360-degree view of downtown Knoxville, the Great Smoky Mountains, World’s Fair Park, the Tennessee River, and the University of Tennessee Campus. Visitors can also explore a timeline, gallery, memorabilia, and gift shop from the fair.