Skydeck Chicago is the breathtaking, thrilling observatory destination atop the iconic Willis Tower. The highest observation deck in the United States, Skydeck provides views of the city spanning up to four states and 50 miles on a clear day. Named a Tripadvisor.com World’s Top 10 Attraction, Skydeck features The Ledge; five glass floor balconies extending 4.3 feet from Willis Tower and made up of three layers of half-inch thick glass laminated into one seamless unit. After undergoing an extensive transformation, Skydeck offers a can’t miss, one-stop attraction to discover and see all that the city of Chicago offers from an incomparable vantage point. The revamped attraction features a brand-new, lower-level, museum-like interactive experience that celebrates the unique personality, history, neighborhoods and sites of Chicago.