This interactive timeline chronicles the events of 9/11 using images, audio and video from the 9/11 Memorial Museum's permanent collection. The timeline tells the story of the day as it unfolded in the air and on the ground. It's filled with first-person accounts from survivors, first responders and witnesses. Please note: Due to the nature of events related to the Sept. 11 attacks, the timeline contains some graphic images and sensitive content. Parents may want to first review the site before sharing it with young children.