A photograph of the of the World Trade Center site (Ground Zero) with an overlay showing the original building locations. Date: 23 September 2001 (photograph), 2005 or earlier (overlay) Source: http://wtc.nist.gov/, for example, report NIST NCSTAR 1: Federal Building and Fire Safety Investigation of the World Trade Center Disaster: Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower, figure 4-1, page 47 (in this report image erroneously credited as created in 2001-09-17). Author: Photograph by National Oceanic and Atmospheric Administration, overlay by National Institute of Standards and Technology. Public Domain.
{}