Sears Tower (Willis Tower)

Willis Tower was known as Sears Tower until 2009. This 443.2-meter (527-meter-high spire) skyscraper stands in Chicago, Illinois. Its construction began in August 1970 and was completed three years later on May 4, 1973.

At the time of completion, Sears Tower had 110 floors and was the tallest skyscraper in the world. He held this status for almost 25 years, and to date has moved to only fifth position. However, at the moment it is the tallest skyscraper in the United States.

The total area of the building exceeds 418,000 square meters - this is equal to 57 football fields. The building has 104 high-speed elevators that divide the building into three zones.