I've been meaning to share these images. Actually, they're digital photos of the same photograph, with the 2nd in closeup. The full photograph by Joel Meyerowitz appears in
Aftermath: World Trade Center Archive.
The west wall of the South Tower is in the first image. The picture was taken in mid-October once much of the debris field in that area was cleared, and what you're seeing, and may be instantly recognizable to you, is the Marriott Hotel lobby, its picures still on the wall.
For a little perspective, the gathering area for fans before entering the Festival registration area is in the left half of the 2nd image.