9/11 conspiracy stuff

li
Okay so a few days ago I saw a post asking where we were on 9/11
There's a lot of talk going on around me about how it was all a conspiracy and no planes went into the towers 
Okay so why did SO many people see it? my question is did any of you live in Manhattan at the time and SEE it happen? Did you see those planes hit the buildings with your own eyes? 
I don't know anyone who has but I saw a few comments from people who were there at that time. Just a question.