NYC's Nordstrom Tower will at least have the tallest roof in the U.S.
The world built more skyscrapers and supertall buildings in 2014 than in any other year in history
VIDEO: BASE jumpers scale 1 World Trade Center construction site and parachute from the top
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VIDEO: Spire-mounted camera captures ascent to the top of the World Trade Center
Construction workers write patriotic messages of hope on beams of One World Trade Center
Workers install base of spire at One World Trade Center