The Willis Tower, formerly known as the Sears Tower, is a famous skyscraper located in Chicago, Illinois. Completed in 1973, it stands at 1,450 feet tall, making it one of the tallest buildings in the United States. The tower has 110 floors and features a distinctive black glass exterior, which has become an iconic part of the Chicago skyline. Visitors to the Willis Tower can enjoy breathtaking views of the city from the Skydeck, located on the 103rd floor. The Skydeck includes glass boxes that extend out from the building, allowing guests to experience the sensation of standing over the city below. The tower is a popular tourist destination and a symbol of Chicago's architectural innovation.