A crane towers over the former World Trade Center site in New York, Sept 5, 2011. As the 10th anniversary of the devastating 9/11 attacks falls on Sunday, the families of the victims will take part in the commemoration and the National September 11 Memorial and Museum in New York will be officially opened to the public. The victims' names will also be carved onto the National September 11 Memorial. [Photo/Xinhua]

The exterior scene of the National September 11 Museum, Sept 5, 2011. [Photo/Xinhua]