Tourists in the all glass balcony skydeck observation deck view the Chicago skyline103rd floor of..., Stock Photo, Picture And Rights Managed Image. Pic. YR6-1417882 | agefotostock
Glass platform on Chicago\
Chicago Skydeck: Why Willis Tower is a Must-see in Chicago travel notes and guides – Trip.com travel guides
Willis Tower Suspends Visitors Above Chicago - The New York Times