The "Tribute in Light" memorial is in remembrance of the events of Sept. 11, 2001, in honor of the citizens who lost their lives in the World Trade Center attacks. The memorial was first held in March 2002. This photo was taken from Liberty State Park, N.J., on Sept. 11, 2006, the five year anniversary of 9/11. (U.S. Air Force photo/Denise Gould)