Willis Tower is a skyscraper 442 meters high located in Illinois, Chicago, USA. Willis Tower was completed in 1973 and is the tallest building in the world,
exceeding even the high towers of the World Trade Center in New York and holds the record for nearly 25 years. Willis Tower is the tallest building in the United States and the seventh highest in the world as well as being one of the most popular tourist destinations in Chicago. More than one million people have visited the observation space each year.
One of the favorite places for visitors in the Willis Tower is an observation chamber box located on the 103 floor building Willis Tower "The Ledge". The uniqueness of this room is, all over the walls, floor and roof of the room is made of transparent glass so that the visitors can feel the sensation of being at an altitude of 412 meters above the earth's surface. The idea of the transparent chamber first emerged from the visitors who always attach the head to the window glass observation room and leave scars attached. Now the visitors are not only able to stick his head in the window, they also can put his head on the floor as well.
This room can accommodate a weight of 5 tons, and was first opened to the public on July 2, 2009. Non- transparent glass is one of the major changes Willis Tower which underwent renovation in 2009.
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