Look back: Flight 93 memorial construction

Published On: Aug 24 2011 06:58:27 AM PDT   Updated On: Sep 10 2013 11:23:21 AM PDT

Look back at some of the work that went into building the memorial to United Flight 93 in Pennsylvania.

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Richard Snodgrass/National Park Service

Tokens honoring Flight 93 sit near the fence surrounding the permanent memorial's construction site in May 2011.


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