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Willis Tower
The Willis Tower is located in Chicago, Illinois. With 108 floors, it is the second tallest building in America and the 13th tallest in the world.
It has an all-glass see-through observation deck that over 1 million people visit each year. From the Skydeck you can see about 40-50 miles. On a clear day, you can see four states: Illinois, Indiana, Wisconsin and Michigan.
Willis Tower opened in 1973 and took 2,000 workers three years to build. The building occupies 4.5 million square feet of floor space, or about 101 football fields. Robotic window washing machines clean all 16,100 windows.
Want to "experience" the Willis Tower for yourself?
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