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Not content with having the tallest building in America , the owners of Willis Tower in Chicago have installed four glass box viewing platforms which stick out of the building 103 floors up.


The balconies are suspended 1,353 feet in the air and just out four feet from the building's Skydeck.
Visitors get their first view from The Ledge --  four glass balconies suspended from the Tower
Fearless: Five-year-old Anna Kane spreads out on the floor of the 10ft square box  which is 1,353 ft up
John Huston, one of the owners of the Willis Tower, even admitted to getting 'a little queasy' when he ventured out on to the balcony.  However, after 30 or 40 trips, he seems to have become used to it.
Long way up: Even the floor of the platforms are glass - few are brave enough to look straight down. Although some adults felt dizzy after experiencing The Ledge, children seemed to take it in their stride.
Designers say the platforms - collectively dubbed The Ledge - have been purposely created to make visitors feel as they are floating above the city. The reward is unobstructed views of Chicago from the building's west side and a heart-stopping vista of the street and Chicago River below - for those brave enough to look straight down.  It's like walking on ice.
Architect Ross Wimer said:  'We did studies that showed a 4' X 4' deep enclosure makes you feel like you're detached from the building particularly since there's only room for one row of people.'
The Ledge is the world's most awesome view, the world's most precipitous view, the view with the most 'wow' in the world. The balconies are 10ft high and 10ft wide, can hold five tons, and have glass which is 1.5 inch thick.
Thrill seekers: The boxes jut out four feet from the building  and were specifically designed to attract visitors. The Willis Tower has always been about superlatives  - tallest, largest, most iconic.
Inspiration came from the hundreds of forehead prints visitors left behind on The Skydeck windows every week.  Now, staff have a new glass surface to clean: Floors!
The Ledge is accessible from The Skydeck which attracts 25,000 visitors on clear days. They each pay $15 to take an elevator ride up to the 103rd floor of the 110-story office building  that opened in 1973.