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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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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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. hide caption

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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

itoggle caption Saul Loeb/Getty Images / Mark Lennihan/AP