The National 9/11 Memorial & Museum has launched Make History, "a world-wide initiative to gather any and every 9/11 story in an effort to understand history from the perspective of those who witnessed it. Using the website, visitors can search, group and sequence any number of histories, photos or experiences, creating custom sequences by time, geography or theme. Each photo is overlaid on a current street-view image of the present day, creating a 'double exposure' of past and present."
The site was created by Local Projects. Visit 911history.org to submit photos, stories, and video.