An American flag is unfurled during a commemoration to mark the 10th anniversary of the Sept. 11 attacks on the United States, at the Trocadero plaza , near the Eiffel tower, seen in the background, in Paris, Sunday, Sept. 11, 2011. (AP Photo/Thibault Camus)
International 9/11 Memorials
January 1, 1970
People around the world honor the victims of the September 11 attacks.