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June 29, 2016

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A tourist is photographed on the floor of one of four transparent ledges that jut out from the 103rd floor of the Willis Tower in Chicago on Thursday, May 29, 2014.

M. Spencer Green / AP

A tourist is photographed on the floor of one of four transparent ledges that jut out from the 103rd floor of the Willis Tower in Chicago on Thursday, May 29, 2014.