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Fifteen years after the Sept. 11, 2001 terrorist attacks, friends and families still grieve. Children still search for understanding. Survivors still suffer. The nation, and the world, still remembers.

NBC News and MSNBC present a look back at the day of terror that killed nearly 3,000 people in New York, Washington, D.C., and Shanksville, Pennsylvania, examining its lasting impact at home and around the globe.

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John Makely / NBC News
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'It Doesn't Get Easier': Remembering Sept. 11, 15 Years Later

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Flags Destined for Military Bases Dedicated on 9/11 Anniversary

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America Marks 15th Anniversary of 9/11 Terror Attacks

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President Obama Lays Wreath at the Pentagon in Honor of 9/11

Secrets of 9/11: New Details of Chaos, Nukes Emerge

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Shanksville, Pa. Remembers United Airlines Flight 93

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President Obama Marks 15th Anniversary of 9/11

Hope and Despair: Being Muslim in America After 9/11

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Watch Live: Flight 93 Honored on 15th Anniversary of 9/11 in Shanksville

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Photojournalist Survived Close Call with South Tower Collapse on 9/11

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15 Years After 9/11 Emotions Run Deep

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Remembering 9/11 15 Years Later

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

Obama on 9/11: 'Americans Will Never Give In to Fear'

9/11 Anniversary: How Lower Manhattan Has Healed Since Sept. 11 Attacks

Too Young to Remember: How Kids Comprehend 9/11

Afghanistan Post-9/11: NBC News' Fazul Rahim on the Battle of Hope vs. Fear

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'That Day Changed All of Us': A Look Back at 9/11, 15 Years Later

Children of 9/11 Firefighter Honor the Hero They Never Knew

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Remembering 9/11: Survivors Share Their Stories

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'Twin Towers' Mattress Ad Sparks Outrage

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TODAY Flashback: How the World Changed in 24 Hours

Did the Patriot Act Change US Attitudes on Surveillance?

Generation 9/11: Growing Up Under U.S. Invasion's Shadow

Iconic 9/11 Flag, Missing for Years, Will Return to Ground Zero

'The Forgotten 9/11': Returning to the Pentagon 15 Years Later

Still Missing: Unidentified Remains Leave a Lingering Void for 9/11 Families

15 Years Later: Tell NBC #WhereWereYou911