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Willis Tower
Cracks in ledge box at Willis Tower cause alarm
Cracks in ledge box at Willis Tower cause alarm

The famous Skydeck of the Willis Tower — which features a set of transparent ledges situated more than 1,300 feet in the air and extending 4.5 feet out from the skyscraper — experienced what appeared to be cracks in one of its boxes on Wednesday, alarming tourists who had come to the attraction for its aerial views of Chicago. Cracks seemed to appear in parts of the floor of a ledge box on Wednesday evening. The fissures appeared beneath tourists' feet in the structure's floor, which provides a transparent view of the 102 stories below.   Officials at the Willis Tower said the cracking was in a scratch-resistant coating on the glass structure and did not affect the structural integrity...

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