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Chicago skyscraper's viewing deck cracks under tourists' feet – 1,353ft up | Architecture | The Guardian
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New Willis Tower observatory attractions may include rappelling from the 103rd floor - Curbed Chicago
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Transparent Balcony on 103 Floor Skyscraper the Sears Tower, Chicago | Sears tower, Sears tower chicago, Willis tower
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Advanced Interlayer Solutions Division: Laminated glass strength and clarity reach new heights at Skydeck Chicago
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