I wanted to tell you about the Sears Tower located in Chicago, IL. It is one os the largest buildings in North America. When I was a child I remember my mom taking me and my younger brother to visit the Sears Tower quite often, we would go all the way to the top where you can stand up to the big glass windows and look out to see all of Chicago. The also had telescopes where you put in a dime and you could see things close up that were really so far away. Here is a links you can go to if you would like to read more about this tall building
http://www.thesearstower.com/home2.axis
http://www.searstower.org/home.html
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