From a panel I learn that not all this huge area was occupied by the two towers: the builings were seven.
Still, it's not strange that 3000 people were there, that morning.
From a photo, comparing the WTO towers with the black wkyscraper that still stands, I see - astonishing - that they were more than twice as tall as it.
Im am therefore not able to imagine how tall they could have been.
Let's go somewhere else. Here is sad.