In the aftermath of the September 11, 2001 attacks, a callery pear tree emerged from the rubble. It now stands at ground zero as a symbol of hope.

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Alice Martin, who lost her husband on September 11, 2001, gets a private tour of the memorial site and learns the story of the Survivor Tree.

Out of the rubble of the World Trade Center rose a symbol of hope for many in the days after 9/11. Part of the Emmy Award winning web series, Remembering 9/11.

Shirley Dreifus, owner of the now-iconic flag raised at Ground Zero on September 11, 2001, tells the incredible story of the flag's role in the recovery, its disappearance, and the search to find it again.

Take a look at how 9/11 became a benchmark for whole generations of young Americans, influencing their attitudes about service, terror, and hope.

On September 14, 2001, a day he declares a national day of mourning and remembrance, President George W. Bush stands atop a pile of rubble at Ground Zero and says that the terrorists responsible for the September 11 attacks will hear from America soon.

A photographer documents the efforts of Ground Zero workers in the days after September 11th. Part of the Emmy Award winning web series, Remembering 9/11.