Tallest Buildings in the World
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One World Trade Center
One World Trade Center soars above New York City at a pinnacle height of 1,776 ft, making it the tallest building in the United States; its spire makes it the fourth-tallest skyscraper in the world. The design by the firm of Skidmore, Owings and Merrill incorporates advanced life-safety systems and sustainable design. The 104-story building includes 3 million square feet of office space and features an observation deck. Source: http://www.wtc.com and http://www.panynj.gov
Fun Fact: Its height (1,776 ft) is symbolic of the year the Declaration of Independence was signed.
Photo source: Joe Mabel (Flickr) [CC-BY-SA-2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons