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Chicago skyscraper's viewing deck cracks under tourists' feet – 1,353ft up | Architecture | The Guardian
View From Chicago Skydeck, top floor of the Sears (Willis) Tower. Chicago IL June 6, 2016 - Chicago in the late 20th and 21st Century! | OpenSea
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Tourists on The Ledge of the Skydeck observation deck on top of the Willis Tower (former Sears Tower). Chicago, Illinois, USA Stock Photo - Alamy
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