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    Soldiers honor fallen veterans from 9/11 with 22-mile walk

    01:55
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    03:04
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  • Watch: Moments from ceremonies marking 21 years since 9/11 attacks

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    03:28
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    03:20
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    01:08
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    09:10
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    08:18
  • Moment of silence marking when United Flight 175 struck south tower

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  • Full Special: ‘America Remembers 9/11: 20 Years Later’

    01:45:17
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Nightly News

9/11: 15 Years Later, Looking Back on the Day the World Changed

04:04

It has been 15 years since the Twin Towers, the Pentagon, and the Pennsylvania countryside were struck by hijacked passenger planes. Lester Holt looks back at how the U.S. and the world have changed.