Books, souvenirs and other products to help you remember your time exploring Willis Tower, which was once the tallest building in the world. The stepped-back profile, reminiscent of skyscrapers of the 1920s, is a solution to the engineering challenge of supporting such a tall tower. The building consists of nine separate structural tubes bound together to strengthen the central sections which extend the full height of the tower.

Books, souvenirs and other products to help you remember your time exploring Willis Tower, which was once the tallest building in the world. The stepped-back profile, reminiscent of skyscrapers of the 1920s, is a solution to the engineering challenge of supporting such a tall tower. The building consists of nine separate structural tubes bound together to strengthen the central sections which extend the full height of the tower.