A construction worker looks up at One World Trade Center in New York City, the central skyscraper under construction at Ground Zero, a year before its 2013 completion. Spencer Platt/Getty Images hide caption

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Spencer Platt/Getty Images

For Those Who 'Worked The Pile' At Ground Zero, Horrors Of Sept. 11 Haven't Faded

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The 9/11 Responders Remembered Memorial in Nesconset, N.Y. John Feal spends 10 hours a day vetting responders for inclusion on the memorial. Courtesy of FealGood Foundation hide caption

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Courtesy of FealGood Foundation

Honoring The Other Fallen Of Sept. 11: Sickened Ground Zero Volunteers

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Then: A composite image of Donald Trump (left, clockwise), New York City Mayor Rudy Giuliani, Sen. Hillary Clinton, Tim Kaine, Rep. Nancy Pelosi and Rep. Tim Kaine. Getty Images and AP hide caption

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Getty Images and AP

People look out at the former site of the World Trade Center in New York City in 2005, where construction had started on Freedom Tower. Spencer Platt/Getty Images hide caption

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Spencer Platt/Getty Images

Members of the Taliban militia ride in vehicles during Afghanistan's annual Independence Day parade in Kabul on Aug. 19, 2001. Afghanistan was largely cut off from the world during the Taliban's rule from 1996 to 2001. That changed dramatically after the Sept. 11 attacks. Saeed Khan/AFP/Getty Images hide caption

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Saeed Khan/AFP/Getty Images

Three World Trade Center is under construction near One World Trade Center, which was completed in 2013. The new building stands 1,079 feet tall, and its topping-out ceremony was held in June. Hansi Lo Wang/NPR hide caption

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Hansi Lo Wang/NPR

In Ongoing Rebuilding Of Ground Zero, A Balance Of Remembrance, Resilience

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Relatives of victims of the Sept. 11 attacks are periodically flown down to Guantanamo Bay, Cuba, to witness court proceedings against five men accused of plotting the attacks. For the witnesses of the most recent court session, the experience raised questions about justice, humanity and the ethics of the death penalty. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

Families Of Sept. 11 Victims Watch Guantanamo Hearings With Mixed Feelings

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Onlookers take cell phone pictures of stranded window washers hanging from scaffolding on the side of One World Trade Center. Timothy A. Clary/AFP/Getty Images hide caption

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Timothy A. Clary/AFP/Getty Images

Comet Lander, Firefighters Execute Dazzling Feats Above The Earth

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An artist's image of the wall that will separate the public from the repository where unidentified remains will be kept at the National September 11 Memorial Museum in Manhattan. 911memorial.org hide caption

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911memorial.org

The Willis Tower (left) in Chicago, photographed on Feb. 15. One World Trade Center (right) in New York City, photographed in November. Saul Loeb/Getty Images / Mark Lennihan/AP hide caption

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Saul Loeb/Getty Images / Mark Lennihan/AP