Wikipedia:Good articles/Willis Tower

The Willis Tower, formerly known as the Sears Tower, is a 108-story, 1,450-foot (442.1 m) skyscraper in Chicago, Illinois. The tower has 108 stories, though the building's owners count the main roof as 109 and the mechanical penthouse roof as 110. It was the tallest building in the world from 1973 until 1998. It was also the tallest building in the Western Hemisphere until 2013. Each year, more than one million people visit its observation deck, the highest in the United States. It is one of Chicago's most popular tourist places.