World Trade Center

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FILE - In this Thursday, Sept. 5, 2013, file photo taken with a fisheye lens, One World Trade Center, center, overlooks the wedge-shaped pavilion entrance of the National September 11 Museum, lower right, and the square outlines of the memorial waterfalls in New York. The long-awaited museum dedicated to the victims of the Sept. 11 terror attacks will open to the public at the World Trade Center site on May 21, officials announced Monday, March 24, 2014. (AP Photo/Mark Lennihan, File)

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FILE - This June 27, 2013 file photo shows perimeter box columns from the World Trade Center (WTC) installed in the National Sept. 11 Memorial Museum with a view towards the new 1 World Trade Center, in New York. Recovered from the WTC site after Sept. 11, 2001, this structural steel called “tridents,” rose from the base of the North Tower. The long-awaited museum dedicated to the victims of the Sept. 11 terror attacks will open to the public at the World Trade Center site on May 21, officials announced Monday, March 24, 2014. (AP Photo/Bebeto Matthews, File)

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FILE - In this Sept. 6, 2013 file photo, a photographer take a picture of steel column from the North Tower of the World Trade Center during a media tour of the National September 11 Memorial and Museum, Friday, Sept. 6, 2013 in New York. The long-awaited museum dedicated to the victims of the Sept. 11 terror attacks will open to the public at the World Trade Center site on May 21, officials announced Monday, March 24, 2014. (AP Photo/Mary Altaffer, File)

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FILE - In this Thursday, Sept. 5, 2013, file photo taken with a fisheye lens, One World Trade Center, center, overlooks the wedge-shaped pavilion entrance of the National September 11 Museum, lower right, and the square outlines of the memorial waterfalls in New York. The long-awaited museum dedicated to the victims of the Sept. 11 terror attacks will open to the public at the World Trade Center site on May 21, officials announced Monday, March 24, 2014. (AP Photo/Mark Lennihan, File)

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Justin Casquejo, 16, of New Jersey posted to Twitter in August this photo of himself facing 1 World Trade Center in lower Manhattan.

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The I-beam cross found in the wreckage of the World Trade Center in 2001. Associated Press photo

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Metropolitan Transit Authority police guard a closed pedestrian walkway next to 1 World Trade Center, left, on Tuesday, Feb. 11, 2014 in New York. The new 1 World Trade Center, the nation's tallest building, was recently cordoned off so pedestrians could avoid injury from falling ice. (AP Photo/Bebeto Matthews)

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In this Tuesday, Feb. 11, 2014 photo, pedestrians pass a closed walkway next to 1 World Trade Center, left, in New York. The new 1 World Trade Center, the nation's tallest building, was recently cordoned off so pedestrians could avoid injury from falling ice. (AP Photo/Bebeto Matthews)