Sears Tower
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Chicago's Willis Tower (left), formerly known as the Sears Tower, has lost its title as the tallest building in the United States to the new 1 World Trade Center in New York. (AP Photos)
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With the Sears Tower behind them, pedestrians head away from their offices in downtown Chicago, Tuesday morning, Sept. 11, 2001, in Chicago. Many Chicago buildings, including the Sears Tower, were shut down as security measures in response to the attack at the World Trade Center in New York.(AP Photo/M. Spencer Green)
