Witness 9/11

I am watching "Witness 9/11" on the National Geographic network; and am posting this between commercials. The caption reads: Amateurs and professional film makers capture the events of 9/11. So far it's showing film footage in New York city. It is still hard to believe that the towers are gone. I had the fortunate opportunity to take the high speed elevator to the observation deck back in when I was a High School student in the early 1980's. I least have the memory of it in my head.