AP Photo/Mark Lennihan
Women wearing dust masks flee across New York's Brooklyn Bridge from Manhattan to Brooklyn following the collapse of both World Trade Center towers on Sept. 11, 2001.
Amy Sancetta
Pedestrians on Beekman Street flee the area of the collapsed World Trade Center towers in lower Manhattan following the terrorist attacks on the New York landmarks on Sept. 11, 2001.
Gordon Donovan/CBSNews.com
A couple passes the parking garage on Beekman Street in New York, Sunday, Sept. 4, 2011, the area that was choked by smoke and dust after the collapse of the World Trade Center towers in 2001.
AP Photos/Amy Sancetta
Pedestrians on Park Row flee the area of the World Trade Center as the center's south tower collapses following the terrorist attack on the New York landmark on Sept. 11, 2001.
AP Photo/Gulnara Samoilova
Survivors of the World Trade Center terrorist attacks make their way through smoke, dust and debris on Fulton St., about a block from the collapsed towers on Sept. 11, 2001, in New York.
AP Photo/Chris Kline
A piece of debris, possibly from one of the crashed airliners, lies on the corner of Murray Street in lower Manhattan near the World Trade Center site in New York on Sept. 11, 2001.
Gordon Donovan/CBSNews.com
All debris has been cleared away on the corner of Murray Street in lower Manhattan near the World Trade Center site, Sunday, Sept. 4, 2011.
AP Photo/Mark Lennihan
With the skeleton of the World Trade Center twin towers in the background, New York City firefighters work amid debris on Cortlandt Street after the terrorist attacks on Sept. 11, 2001.
AP Photo
A subway entrance is covered in debris at the intersection of Church and Dey Streets after the World Trade Center collapse in New York City on Sept. 11, 2001.
Gordon Donovan/CBSNews.com
The new subway station on Church and Dey Streets nearly 10 years later, as construction continues across the street at the World Trade Center site, Sunday, Sept. 4, 2011.
Gordon Donovan/CBSNews.com
The intersection of Greenwich and Rector Streets, looking north to where 2 World Trade Center once stood, Sunday, Sept. 4, 2011.
AP Photo/John Labriola
Ash covers gravestones in Trinity Church on Sept. 11, 2001 after the attacks on the nearby World Trade Center towers in New York.
Gordon Donovan/CBSNews.com
The courtyard and graveyard at Trinity Church in Lower Manhattan nearly 10 years after the attacks on the Twin Towers, Sunday, Sept. 4, 2011.
Gordon Donovan/CBSNews.com
Construction is still underway on Fulton Street looking west towards the where the towers of the World Trade Center once stood, Sunday, Sept. 4, 2011.
AP Photos/Richard Drew
The north tower of New York's World Trade Center collapses after being struck by hijacked American Airlines Flt. 11 on Sept. 11, 2001.
Gordon Donovan/CBSNews.com
The skyline of lower Manhattan Sunday, Sept. 4, 2011, where the towers of the World Trade Center stood is still under going construction all around the area.
AP Photo
Firefighters and urban rescue workers work at the site of collapsed World Trade Center towers after the terrorist attacks in New York, on Sept. 19, 2001.
