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September 11 Anniversary: 50 Pictures We’ll Never Forget

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An unidentified New York City firefighter walks away from Ground Zero after the collapse of the Twin Towers. (Anthony Correia/Getty Images)

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Today marks the 13th anniversary of the September 11, 2001, tragedy, when terrorist attacks by al-Qaeda killed nearly 3,000 people in New York City and Washington, D.C. Remember those who died on this day that changed everything.