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  • Remembering 9/11 15 Years Later

    03:46
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  • Now Playing

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

    04:04
  • UP NEXT

    Too Young to Remember: How Kids Comprehend 9-11

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  • 9/11: In Our Own Words, Part 1

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  • 9/11: In Our Own Words, Part 2

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  • 9/11: In Our Own Words, Part 3

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  • 9/11: In Our Own Words, Part 4

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  • 9/11: In Our Own Words, Part 5

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  • 9/11: In Our Own Words, Part 6

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  • 15 Years Later a New Victim of 9/11

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  • Watch: Moments from ceremonies marking 21 years since 9/11 attacks

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  • FBI releases declassified document into links between Saudi Arabia and 9/11 hijackers

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  • As US remembers 9/11, Taliban tightens its grip on Afghanistan

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  • Watch: Divers install American flag underwater to commemorate 9/11

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  • Watch: Biden, Harris take part in wreath-laying ceremony at Pentagon

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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.