A member of Chicago's news media steps onto "The Ledge", a five-sided glass box 1,353 feet (412 meters) above Wacker Drive in Chicago July 1, 2009. The Ledge is part of Skydeck
Tourists in the Glass Transparent Box at the Willis Tower Sky Deck Observer Editorial Image - Image of casual, adult: 148348545
woman in glass box in Chicago Illinois Stock Photo - Alamy
Skydeck Chicago - The Ledge - ingenieurmagazin.com
Willis Tower in Chicago have installed four glass box viewing platforms : Amusing photos