Construction of Flight 93 National Memorial

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.