New Life After 9/11 at Ground Zero

Sunday marks 15 years since the terror attacks of September 11, 2001, that killed nearly 3000 people at the World Trade Center, the Pentagon, and in Shanksville, Pennsylvania. It's a day New York City won't soon forget, and we have built countless tributes to ensure that we don't. Tonight, we take a look at a new documentary that chronicles the building of the 9/11 Memorial Plaza and it trees.