Top 10 observatories in the world

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3 Skydeck at Sears Tower, Chicago, Illinois, US

The glass balcony is suspended 1,353 feet (412 meters) in the air and juts out 4 feet (1.22 meters) from the Sears Tower's 103rd floor Skydeck. Visitors can see four US states on a clear day. The glass floor on the balcony is 12.7 cm thick and can bear a load of about five tons.

Top 10 observatories in the world

3 Skydeck at Sears Tower, Chicago, Illinois, US. [CRI] 


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