All four boxes of The Ledge, the 103rd floor tourist attraction atop Chicago's Willis Tower, were closed today for inspection after tourist report hearing a cracking sound under their feet on the Skydeck Alejandro Garibay, his brother, and two cousins were in the glass enclosure that juts out of the west side of the building shortly before 10 p.m. Wednesday when Garibay said they heard cracking. Click here for the full story and what the building owners claim it was. I do not care I think I will take this site off my bucket list, how about you ?? :) http://www.nbcnews.com/news/us-news/glass-ledges-coating-cracks-under-tourists-sky-n117861