Gosh all of it is seared on my memory.
The moment the second plane hit, and you realised it wasn't an accident, and the world was about to change.
The falling people and the thuds as their bodies hit the roof below.
The moment the first tower fell, and the utter disbelief.
The wondering how many more planes had been hijacked, and who would be hit next.
The views of the city from above, shrouded in dust.
The way everything stopped for a few days.
The signs and photos all over NY looking for loved ones.
The pictures of people covered in dust, walking up Manhatten.
I was in the UK, nowhere near it. No one I knew at the time was there (thank goodness). Even so, it all felt absolutely horrifying.