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Willis Tower SkyDeck ledge in Chicago cracks under visitors' feet | CNN
New Willis Tower observatory attractions may include rappelling from the 103rd floor - Curbed Chicago
Willis Tower Skydeck Glass Cracks, Scares Living Crap Out of Everyone - Thrillist
Sears Tower Glass Platform ~ Chicago, Illinois. Add this to your vacation bucket list. Redefine the meaning… | Skydeck chicago, Chicago travel, Willis tower skydeck
Cracks appear on floor of glass viewing platform in Chicago's Willis Tower | News | wqow.com