I know exactly where I was. I was doing some work at the offices of a TV channel, so there were TVs around the place, but not in the room I was using. When I went to get a drink I saw a building with smoke on the screen, but didn't register what it was until later. When we tried to look online for information the Internet had ground almost to a halt.

It was a terrible event that depressed me for some time. I didn't directly know people who were there, but friends of friends were. Many more people have been killed around the world as the US and others lashed out.

It is amazing there has been nothing like this since then, although we have had smaller incidents in Europe. Changes to air travel security made it harder to replicate, but terrorists look for other opportunities.

I visited the site a few years later, but don't think I have pictures.