Willis Tower's glass floor CRACKS under tourists' feet | Daily Mail Online
Willis Tower's glass floor CRACKS under tourists' feet | Daily Mail Online
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Willis Tower's glass floor CRACKS under tourists' feet | Daily Mail Online
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TORONTO, CANADA - MAY 7, 2007: Man's feet on the glass floor of – Stock Editorial Photo © deymosd #47288913
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Willis Tower's glass floor CRACKS under tourists' feet | Daily Mail Online
