We all have our own memories associated with the tragedy of 9/11. In my case I can remember going to Ground Zero shortly after the attacks and noticing that awful, pungent smell of the place, as if the terrorists had opened up some special, sulfurous path to hell. Later, directing the commission investigating what happened, I have vivid memories of tramping through the Tarnak Farms camp in Afghanistan where Osama bin Laden had once had a headquarters.
Philip Zelikow