File-This Oct. 18, 2014, file photo shows One World Trade Center in the background, as people gather, bottom, for a groundbreaking ceremony at the site of the St. Nicholas National Shrine, in New York.  Thirteen years after the 9/11 terrorist attack, the resurrected World Trade Center is again opening for business, marking an emotional milestone for both New Yorkers and the nation. Publishing giant Conde Nast will start moving Monday, Nov. 3, 2014, into One World Trade, a 104-story, $3.9 billion skyscraper that dominates the Manhattan skyline. It is America's tallest building. (AP Photo/Craig Ruttle, File)

World Trade Center reopens for business

It’s the centerpiece of the 16-acre site where the decimated twin towers once stood and where more than 2,700 people died on Sept. 11, 2001.