Skydeck Chicago is at 233 S. Wacker Dr.; the Skydeck entrance is on Jackson Blvd. between Wacker Dr. and Franklin St. The 103rd floor observation platform at the 110-story Willis Tower (formerly the Sears Tower)—the second-tallest building in North America and the Western Hemisphere—allows spectacular views of the city. Brave visitors can step out onto The Ledge—1.5-inch-thick glass-enclosed viewing cubes extending more than 4 feet from the west side of the building—allowing you to look 1,353 feet straight down.
Interactive exhibits and an 8-minute theater presentation feature the tower's history and showcase the best of Chicago.