Construction of Flight 93 National Memorial

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View of the Memorial Plaza from the Western Overlook, June 2011. (Photo by Richard Snodgrass)
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Paving prep work on the Memorial Plaza, May 2011. (Photo by Richard Snodgrass)
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Wetlands, May 2011. (Photo by Richard Snodgrass)
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Memorial Plaza under construction, May 2011. (Photo by Richard Snodgrass)
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Arrival area, Memorial Plaza, May 2011. (Photo by Richard Snodgrass)
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Entrance road under construction, June 2011. (Photo by NPS/Brendan Wilson)
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Visitor Shelter and Gateway area, June 2011. (Photo by NPS/Brendan Wilson)
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Field of Honor and Ring Road, June 2011. (Photo by Richard Snodgrass)
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Working on the Memorial Plaza Walkway, June 2011. (Photo by Richard Snodgrass)
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Working on the Visitor Shelter and Gateway area, June 2011. (Photo by Richard Snodgrass)
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Visitor Shelter and Gateway area, June 2011. (Photo by NPS/Brendan Wilson)
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Arrival Forecourt and Gateway to the Memorial Plaza, July 2011. (Photo by Paul Murdoch Architects)
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Sidewalk Approach to the Memorial Plaza, July 2011. (Photo by Paul Murdoch Architects)
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Field of Honor, July 2011. (Photo by Paul Murdoch Architects)
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The Arrival Court at the Memorial Plaza, July 2011. (Photo by Paul Murdoch Architects)
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Memorial Plaza along the Crash Site, July 2011. (Photo by Paul Murdoch Architects)
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Ceremonial Gateway to the Crash Site, July 2011. (Photo by Paul Murdoch Architects)

In 2005, relatives of those who died on Flight 93 helped select architect Paul Murdoch's winning design for a memorial at the crash site in Somerset County, Pa.. The remote area proved a challenge. It is a former coal-mining site that required major soil and water cleanup. Phase one of the Flight 93 National Memorial will be unveiled on the 10th anniversary weekend of Sept. 10 and 11, 2011.