The 9/11 Museum's collections include artifacts and oral histories to remember the day and to commemorate the lives of those who were lost.
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"The Museum’s 110,000 square feet of exhibition space will be located within the archaeological heart of the World Trade Center site—telling the story of 9/11 through multimedia displays, archives, narratives and a collection of monumental and authentic artifacts. The lives of every victim of the 2001 and 1993 attacks will be commemorated as visitors have the opportunity to learn about the men, women, and children who died.
The monumental artifacts of the Museum provide a link to the events of 9/11, while presenting intimate stories of loss, compassion, reckoning, and recovery that are central to telling the story of the attacks and the aftermath."
https://www.911memorial.org/museum
Since September 11, 2001, the International Center of Photography has maintained the September 11 Archive, a collection of photographic materials related to the events of that day. The archive of over fifteen hundred objects includes a comprehensive collection of newspapers from September 11 and the following days, a portion of the exhibition "Here is New York," photographs by photojournalists and bystanders, missing persons posters, publications, videos, and other historical artifacts.