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Artifacts from Sept. 11 attacks displayed by Smithsonian

Michael Reynolds / EPA

Objects from the New York display are seen at the 'September 11: Rememberance and Reflection' exhibition at the Smithsonian National Museum of American History, in Washington DC, USA, 01 September 2011. The exhibit displays over 50 objects recovered from the 11 September 2001 attack in New York, the Pentagon and Shanksville, Pennsylvania. The exhibit opens to the public 03 September 2011, before the tenth anniversary of 9/11. In this picture; a briefcase found in the debris (front), a picture of the burning World Trade Center (back), and a cell phone used by former Mayor Rudolph Giuliani on 11 September 2001 (2-R).

Saul Loeb / AFP - Getty Images

A flight attendent call button from United Airlines Flight 93, which crashed in Shanksville, Pennsylvania during the September 11, 2001 attacks after passengers fought with terrorists, are seen alongside other artifacts as part of a temporary exhibit at the Smithsonian National Museum of American History in Washington, DC, September 1, 2011. Running for for the 9 days leading up to the 10th anniversary of the terrorist attacks, the Museum will display more than 50 objects from the World Trade Center, Pentagon and Shanksville, Pennsylvania, in an exhibit titled, "September 11: Remembrance and Reflection."

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A flight speed indicator from United Flight 93 found at the crash site in Shanksville, Pennsylvania.

Win Mcnamee / Getty Images

A clock that was knocked from a wall at the Pentagon during the September 11, 2001 attacks.

Related PhotoBlog: New 9/11 exhibit at the Newseum marks 10th anniversary of the attack