Willis Tower Skydeck in Chicago
Formerly known as the Sears Tower, the newly-renamed Willis Tower was completed in 1974 in downtown Chicago at 233 South Wacker Drive. The 108-story building was the tallest building in the world for nearly 25 years and still holds the title for tallest building in the United States.
The building's observation deck, the Skydeck, is located on the 103rd floor, about 1,353 feet above ground. The Skydeck is one of Chicago's most popular tourist attractions and welcomes approximately 1.3 million visitors annually. Recent renovations have introduced new glass balconies with glass floors. The balcony extends four feet over the street and provides gorgeous views of Illinois, Lake Michigan and even neighboring states Indiana, Michigan and Wisconsin on a clear day. There is a second deck on the 99th floor, reserved for when the 103rd Skydeck is closed.