Sunday is the tenth anniversary of 9/11. On September 11, 2001 terrorists hijacked four planes and flew two of them into the World Trade Center in New York City, another crashed into the Pentagon building near Washington, D.C., and the remaining plane crashed in a field in Pennsylvania. The National Geographic Society was directly affected that day, as two Society employees were on one of the planes. Many people will be remembering the events of that day. The memorials at the World Trade Center site and at the Pentagon will continue to help people remember 9/11 long into the future.

National Geographic Kids magazine interviewed students from a school four blocks away from the World Trade Center when they returned to their school five months after 9/11. In the September 2011 issue, you can find out what some of the students are doing ten years later.

Click here to learn about the 9/11 memorial in New York City.

Click here to learn about the 9/11 memorial at the Pentagon near Washington, D.C.

Photograph by Matt McClain, The Washington Post/Getty Images