World's tallest buildings

Associated Press
In this March 23, 2012, photo, an ironworker walks a steel beam at the top of One World Trade Center in New York. One World Trade Center, the giant monolith being built to replace the twin towers destroyed in the Sept. 11 attacks, will lay claim to the title of New York City’s tallest skyscraper on Monday, April 30, as workers erect steel columns that will make its unfinished skeleton a little over 1,250 feet, just high enough to peak over the observation deck on the Empire State Building. The milestone is a preliminary one. The so-called “Freedom Tower,” isn’t expected to reach its full height for at least another year, at which point it is likely to be declared the tallest building in the U.S.  (AP Photo/Mark Lennihan)

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The world's tallest tower and Japan's biggest new landmark, the Tokyo Skytree, opened to the public on May 22. Dubai's Burj Khalifa holds the title of world's tallest structure, which stands 828 meters (2,717 feet).

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