Take in unforgettable sights from Skydeck Chicago, the highest observation deck in the United States. Perched atop the Willis Tower (formerly Sears Tower), gaze across the Windy City and enjoy views that reach across four states on a clear day. Then, step onto The Ledge, a series of glass-floored balconies that extend 4.3 feet from the building for a heart-racing view beneath your feet. Complete your visit with admission to the 30,000-square-foot museum that showcases Chicago's vibrant history.