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Chicago skyscraper's viewing deck cracks under tourists' feet – 1,353ft up | Architecture | The Guardian
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Visitors' Worst Nightmare Comes True As The Glass Floor On 103rd Floor Shatters Under Their Feet | Bored Panda
Tourist attraction The Ledge at Willis Tower reopens after protective coating cracks 103 floors up - Chicago Tribune
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Glass Skydeck on 103rd floor of Chicago tower CRACKS under terrified visitors' feet | Daily Mail Online
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Glass Skydeck on 103rd floor of Chicago tower CRACKS under terrified visitors' feet | Daily Mail Online
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