Tourists to Chicago are petrified after part of Willis Tower's "Ledge" -- a glass cube which juts out from the 103rd floor Skydeck -- begins to crack as they're standing on it. Vanessa Johnston ... more 
Tourists to Chicago are petrified after part of Willis Tower's "Ledge" -- a glass cube which juts out from the 103rd floor Skydeck -- begins to crack as they're standing on it. Vanessa Johnston reports. less 
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Thu, May 29, 2014 4:35 PM EDT