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Roses placed by the mother of an architect who died during the Sept. 11 terrorists attacks are erected off his name on the edge of the South Pool at the World Trade Center on September 25, 2015 in New York City.
Roses placed by the mother of an architect who died during the Sept. 11 terrorists attacks are erected off his name on the edge of the South Pool at the World Trade Center on September 25, 2015 in New York City.

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    Remembering 15 years since 9/11 attacks

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Remembering 15 years since 9/11 attacks

CNN's Karin Caifa explains how people are remembering those who died.

Remembering 15 years since 9/11 attacks

CNN's Karin Caifa explains how people are remembering those who died.