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Crack appears on Chicago's Willis Tower ledge - 6abc Philadelphia
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Willis Tower Ledge closes after report of glass cracks | Crain's Chicago Business
Willis Tower Suspends Visitors Above Chicago - The New York Times
:format(jpeg)/cdn.vox-cdn.com/uploads/chorus_image/image/53836025/AR_170329962.0.jpg "New Willis Tower observatory attractions may include rappelling from the 103rd floor - Curbed Chicago")
New Willis Tower observatory attractions may include rappelling from the 103rd floor - Curbed Chicago
Skydeck Chicago: Daring the Glass Floor 103 Stories High
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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This Glass Lets You Stand 1,353 Feet Above Chicago
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