Look back: Flight 93 memorial construction

Published: Aug 24 2011 09:58:27 AM EDT   Updated On: Sep 10 2013 02:23:21 PM EDT

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

Flight 93 Memorial 1
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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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