Willis Tower's renovated viewing point is not for the faint of heart
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Glass Skydeck cracks under visitor's feet 103 stories high at Chicago's Willis Tower
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Willis Tower Ledge closes after report of glass cracks | Crain's Chicago Business
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How Chicagos Willis Tower Is Renovating Security
Breathtaking view from Chicago's Willis Tower's glass boxes 1,353 feet in the air | Daily Mail Online
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Glass ledge cracks at Chicago's Willis Tower - Telegraph
