The Sears Tower, now called the Willis Tower, is one of the top ten tallest buildings in the world. During one trip to Chicago to visit my brother we decided to go to the observation deck. The skyscraper is a 10 story, 1,45o foot high skyscraper. So obviously I wanted to go out in to the glass observation deck. You can see directly under you and so much of the city! It is definitely a view I will always remember!