Since Sept. 11, 2001, the condition of the World Trade Center site has become, in itself, a powerful symbol of the nation’s recovery from the terrorist attacks. Almost from the moment of the buildings’ collapse, the site — where almost 3,000 people were killed — was declared sacred ground.
Rescue and recovery effort after the September 11 attacks on the World Trade Center - Wikipedia
New York 9/11 museum closes after telling tragedy's story, helping survivors heal
View of Ground Zero, New York City, N.Y., Sept. 14, - NARA & DVIDS Public Domain Archive Public Domain Search
Gregg Brown's Aerial Photos of Ground Zero - The New York Times
How 9/11 Changed the World, BU Today
David Rockwell: A memorial at Ground Zero
About the Memorial National September 11 Memorial & Museum
Life Atop Ground Zero. Thirteen years after 9/11, the World…, by Rex Sorgatz, The Message
20 years after: The transformation of Ground Zero - CBS News
Rebuilding Ground Zero Danny Forster & Architecture
The Hole in the City's Heart - The New York Times
The Complete History of Ground Zero: Before and After 9/11 – 911 Ground Zero
Ground Zero - Then and Now