In this Sept. 16, 2001 file photo, an American flag flies from a makeshift altar overlooking the ongoing investigation of the crash of United Airlines Flight 93 in Shanksville, Pa. Before Flight 93 fell from the sky, this patch of southwestern Pennsylvania was a farmer's field, then a strip mine. Then something happened, something unimaginable and unwelcome, national and global. And this place became a place of memory. (AP Photo/Gene J. Puskar, File)
