When the Sears Tower, now called the Willis Tower, was built in 1973 for the Sears Roebuck & Company, it was the world’s tallest skyscraper. Its construction is actually nine separate buildings called “tubes.” They end at various floors until two of them reach the top at 1,451 feet above Wacker Drive. There is a public observation deck on the 108th floor called Skydeck.
