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File:Glass Balconies, Looking West from Willis Tower Skydeck, Chicago, Illinois (9179377925).jpg - Wikimedia Commons
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Tourists in glass balcony skydeck observation deck view Chicago skyline103rd floor of the Willis Tower Sears Tower Stock Photo - Alamy
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The terrifying moment a tourist in a glass box 1,350ft high up sees floor CRACK under him | World | News | Express.co.uk
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Glass Skydeck on 103rd floor of Chicago tower CRACKS under terrified visitors' feet | Daily Mail Online
Cracks on glass floor 103 stories above Chicago shock four men - Grand Forks Herald | Grand Forks, East Grand Forks news, weather & sports
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New Willis Tower observatory attractions may include rappelling from the 103rd floor - Curbed Chicago
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Chicago skyscraper's viewing deck cracks under tourists' feet – 1,353ft up | Architecture | The Guardian
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