Photos: Inside the National September 11 Memorial & Museum

The museum opens to the public on May 21.
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Photos: Inside the National September 11 Memorial & Museum Kevin Lamarque/Reuters
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U.S. President Barack Obama, former New York Mayor Michael Bloomberg, first lady Michelle Obama, former U.S. President Bill Clinton and former Secretary of State Hillary Clinton look at the faces of those who died during the 9/11 attacks, at the National September 11 Memorial Museum in New York. May 15, 2014. Kevin Lamarque/Reuters