Timed tickets are required and advance purchase is recommended. Standard entry fees are covered by Go City Chicago Cards. Restaurants, shops and restrooms can be found inside Willis Tower.

Left photo: Sears Tower became the tallest building in Chicago, surpassing the John Hancock Center, seen in the background, when construction continued in November 1972. (Charles Osgood/Chicago ...

Choose Chicago reported over 575,000 readers ... I used to send people to Sears Tower, do the architecture tour, go down to ...

British insurance broker Willis Group Holdings Ltd. will lease space in the iconic Sears Tower, changing the building's name to Willis Tower. Video courtesy of Fox News.