Twenty years on from the 9/11 terror attacks, New Yorkers and those affected by the events recall where they were and how they have managed to process the horror of what happened. Presenter and New Yorker Joan Mastropaolo, now a volunteer at the 9/11 Tribute Museum, takes us on a tour of the 9/11 memorial and explains what it means to her. Former US poet laureate Billy Collins recalls how writing and performing the official memorial poem – Names. Annie Thoms, a teacher from one of the schools close to ground zero explains how High School students, forced to evacuate amid the confusion. Wajahat Ali, a 20-year-old student at the time recalls how 9/11 changed his and the lives of fellow Muslims overnight.