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A section of the "slurry wall," the surviving
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A section of the "slurry wall," the surviving retaining wall of the original World Trade Center, is displayed during the opening ceremony for National September 11 Memorial & Museum on May 15, 2014.(Credit: Getty Images / Pool)

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9/11 Memorial Museum

The long-awaited National September 11 Memorial & Museum opens to the public on May 21.