- 21000 Sears Tower (was the tallest building of the world for a long time)
- 21001 John Hancock Center (was the tallest in Chicago when built)
- 21002 Empire State Building (is the tallest skyscraper in New York)
- 21003 Space Needle (is the most recognized landmark of Seattle)
![](http://2.bp.blogspot.com/_aBOhbvBc2Vg/SZsd8nr2VXI/AAAAAAAAYYU/UbV3Ip_337k/s400/arch.jpg)
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