Flight 93 Memorial: Shanksville, Pa.

Lloyd Smith, left, and Laura Sprankle of Hagerstown, Md., visit the overlook at the temporary Flight 93 memorial in Shanksville, Pa. on Aug. 1, 2011. In the background are a grove of sweet gum trees that were donated to the Flight 93 National Memorial by the organizers of the Sept. 11 Memorial in New York. The crash of Flight 93 in a field there on Sept. 11, 2001 has brought visitors from around the world to the national park site that now marks the spot where the hijacked plane came down.

Vistor's guides:
Shanksville: Flight 93 Memorial
NYC 9/11 sites
Pentagon Memorial