Cracks appear on floor of glass viewing platform in Chicago's Willis Tower - ABC News
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Glass platform on Chicago's tallest building "cracks" under feet
Chicago Curved Glass Building Architecture Photograph by Paul Velgos - Fine Art America
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Glass floor of Chicago tower's 103rd floor begins to crack under family's feet | The Independent | The Independent
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Glass Skydeck at Chicago's Willis Tower (formerly Sears Tower) Cracks | Time
SOM's revamped Skydeck Chicago at Willis Tower reopens 103 floors above the Windy City
Cracks appear on floor of glass viewing platform in Chicago's Willis Tower - ABC News
Willis Tower Glass Platform – Chicago, Illinois - Atlas Obscura
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Chicago skyscraper's viewing deck cracks under tourists' feet – 1,353ft up | Architecture | The Guardian
Glass platform on Chicago's tallest building "cracks" under feet
