The final piece of the spire at One World Trade Center is lifted into place in New York, May 10, 2013. The tower now rises to a symbolic 1776 feet, making it the tallest building in the western hemisphere. INSIDER IMAGES/Gary He (UNITED STATES)
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Architecture: Debate the race for the sky
Are tall buildings proving a blight on British cities? Join us for a lively debate on the issue with architects, planners and others