The Willis tower (the sears tower)
The Willis tower is a really tall building in Illinois.The Willis tower is a 108 story, 1,451 foot Skyscraper in Chicago, Illinois.The Willis tower is the tallest building in the U.S.A and the 7th tallest in the world.Before July 16th,2009 The Willis Tower was known as The Sears tower.In 2009 The Willis Group Holding obtained the right to rename The Sears tower to The Willis tower. The Willis tower is the most popular tourist destination in Chicago,more then 1 million people visit the Observation Deck which is held on the 108 floor.