Interesting facts about the Willis Tower

The Willis Tower, formerly known as the Sears Tower, is a 108-story skyscraper in Chicago, Illinois, United States. The Willis Tower is 442 meters (1,450 feet) high – 520 meters (1,730 feet) including twin antenna towers. At completion in 1973, it surpassed the World Trade Center towers in New York to become the tallest  building in … Read more