The Willis Tower (also known as the Sears Tower) is the fifth biggest tower in the whole world. Standing 1,730ft (527m) it is located at Chicago, Illinois. It took three years to build this tower. There are 108 floors in the Willis Tower. It took approximately 350,000 employees to build it. The building was designed by a man who took three cigars and stood them at which it looked like the Willis Tower.
One of the most famous things that the Willis tower has is the Sky Deck. It is located in the 103 floor and is 1,353 feet above the ground. In the Sky Deck, there will be a cube glass sticking out of the Willis Tower. Many people will be able to stand on the glass and see how it feels like to be 1,353 feet above the ground level.