The Manhattan skyline is seen from the One World Trade Center observation deck in New York, U.S., on Tuesday, April 2, 2013. The observation deck at One World Trade Center, expected to open in 2015, will occupy the tower's 100th through 102nd floors. Guests visiting the observation deck will see a 'pre-show' about the creation of the building while waiting in line in the lobby. Photographer: Victor J. Blue/Bloomberg via Getty Images