The National September 11 Memorial at Ground Zero will open this September 11th, the tenth anniversary of the attacks.
Architect Michael Arad and landscape architect Peter Walker's design for the memorial, "Reflecting Absence" was selected from a global design competition that included more than 5,200 entries from 63 nations.
According to the Memorial's website, "Twin reflecting pools are each nearly an acre in size and feature the largest manmade waterfalls in the North America. The pools sit within the footprints where the Twin Towers once stood." The Memorial is surrounded by a tree-filled plaza.
The names of all those killed in Sept. 11, 2001 attacks and in the earlier World Trade Center attack on Feb. 26, 1993, are inscribed on bronze parapets surrounding the waterfalls,.
Watch a time-lapse video below of ground zero's dramatic transformation into the 9/11 Memorial.