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New Willis Tower observatory attractions may include rappelling from the 103rd floor - Curbed Chicago
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Glass Skydeck on 103rd floor of Chicago tower CRACKS under terrified visitors' feet | Daily Mail Online
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Visitors' Worst Nightmare Comes True As The Glass Floor On 103rd Floor Shatters Under Their Feet | Bored Panda
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File:Glass Balconies, Looking West from Willis Tower Skydeck, Chicago, Illinois (9179377925).jpg - Wikimedia Commons
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Advanced Interlayer Solutions Division: Laminated glass strength and clarity reach new heights at Skydeck Chicago
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