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Cracks appear on Willis Tower’s 103rd-story ledge

Engineers hope to have one of the Chicago tower’s glass-box ledges open for tourists on Friday after the one-and-a-half inches of glass between tourists and certain doom seemed to crack. NBC’s Katy Tur reports.

Engineers hope to have one of the Chicago tower’s glass-box ledges open for tourists on Friday after the one-and-a-half inches of glass between tourists and certain doom seemed to crack. NBC’s Katy Tur reports.