Formerly known as Sears Tower, it was built in 1974 and was the tallest building in the world at that time. The shape of the building is like nine square hollow cylinders of different heights clustered together, tall and straight, concise and stable, different facade shapes in different directions are different, and it also breaks through the stiff and symmetrical style of general high-rise buildings. At the same time, the wind-resistant structure of high-rise buildings has also been solved by the gradual uptake of the shape characteristics. Visiting the interior of the building, you can get a detailed understanding of the internal structure and architectural principles through exhibitions and micro-films. Of course, the most exciting thing is to stand on the 103-storey skyline viewing platform, courageously step on the transparent viewing platform with all-glass structure, and at the moment you look down, you can see the continuous flow of golden streets and the high-rise buildings in the vicinity, you will really feel the modern city brings people. Infinite charm.