From the nearby World Financial Center, one can see ground zero and the cavities left in Lower Manhattan by the towers destroyed Sept. 11, 2001. Construction workers are making progress on 1 World Trade Center, the largest of four towers planned as part of the $18.7 billion ground zero project. (Andrew Harnick/The Washington Times)
** FILE ** President Bush embraces New York City firefighter Bob Beckwith while standing in front of the collapsed World Trade Center buildings in New York on Sept. 14, 2001. Mr. Bush famously used a bullhorn to reassure ground zero rescue workers, the American public and the world that the terrorists would soon be hearing from the U.S. (Associated Press)
PHOTOGRAPH PROVIDED BY THE U.S. NAVY
The USS New York, with more than 7 tons of steel from the World Trade Center built into its bow, is carrying families of 9/11 victims and first responders from Norfolk, Va., to New York for the 10th anniversary of the attacks.
Families of 9/11 victims and first responders will journey from Norfolk, Va. to the New York Harbor for the 10th anniversary of the terrorist attacks aboard the USS New York, which is bolstered by seven tons of recovered World Trade Center steel in her bow. (Image from US Navy)
A tattered American flag recovered from World Trade Center debris is part of the Smithsonian Institution's upcoming special display of 9/11 "relics," positioned on tables rather than from behind exhibit glass. (National Museum of American History)
** FILE ** The National September 11 Memorial and Museum is under construction, lower right, Tuesday, May 3, 2011, at the World Trade Center site in New York. The memorial is scheduled to open to the public in time for the 10th anniversary to be held Sept. 11, 2011. (AP Photo/Mark Lennihan)
President Barack Obama, center, shakes hands with first responders as he arrives for a wreath laying ceremony at the September 11 Memorial at the World Trade Center site in New York, Thursday, May 5, 2011. (AP Photo/Mark Lennihan)
President Barack Obama, accompanied by a New York City Police officer, New York City Firefighter, and Port Authority officers, carries a wreath to be placed at the World Trade Center site, in New York, Thursday, May 5, 2011. (AP Photo/Richard Drew)
On Sept. 11, 2001, the twin towers of the World Trade Center burn and later collapse after hijacked planes deliberately crashed into them in New York City. A multimillion-dollar reward was offered for now-dead terrorist Osama bin Laden after the attacks.
Edward Vinciguerra (left), a structural supervisor with the Port Authority of New York & New Jersey, watches a 5½-foot-long fragment of an I-beam, salvaged from the World Trade Center, being loaded on a truck on Wednesday. (Associated Press)
Archeologists, center, take measurements of the wood hull of a 32-foot-long (9.75 meters) 18th century boat at the World Trade Center site, Thursday, July 15, 2010 in New York. (AP Photo/Mark Lennihan)