Nearly 3,000 people were killed on September 11, 2001.

9/11 Day was created in 2002 as a nonprofit organization with the support of the 9/11 community and a mission to “rekindle the extraordinary spirit of togetherness and compassion that arose in the immediate aftermath of the 9/11 tragedy, and to inspire Americans and others to do good deeds that help to create a better and more peaceful world.”

On the 22nd anniversary of the September 11th attacks, the organization hopes to inspire people in the U.S. and around the world to perform 100 million good deeds “in remembrance and tribute.” To learn more or join the effort, visit 911day.org.

It was the single largest loss of life resulting from a foreign attack on American soil and the greatest loss of rescue personnel in a single event in American history.

Source: 9/11 Museum & Memorial