Here is a link to a very moving and interesting PBS/Nova video about the attack, the Memorial and the building of One World Trade Center. Walter Koenig brought it to my attention, Click Here: http://www.pbs.org/wgbh/nova/tech/ground-supertower.html
"The National September 11 Memorial is a tribute of remembrance and honor to the nearly 3,000 people killed in the terror attacks of September 11, 2001 at the World Trade Center site, near Shanksville, Pa., and at the Pentagon, as well as the six people killed in the World Trade Center bombing in February 1993."
Thank you, Frank, for these remarkable pictures ....... they help to ease the horrible images I have locked in my memory from that terrible day. It's so good to see the new life there at the World Trade Center. ~V~