Lagoon-side view of the 26-story-tall Sunsphere, the signature landmark of the 1982 World's Fair — and the surrounding World's Fair Park — in Knoxville, the principal city in eastern Tennessee. Among the tower's features: Each pane in the observation "ball" is made with 24-karat gold, giving the sphere its reflective gold color. Each cost around $1,000 in 1962. And its observation deck features a gallery of local images and a 360-degree view of Knoxville. Photo by Carol Highsmith, 2021.