The Flight 93 National Memorial is a memorial built to commemorate the crash of United Airlines Flight 93, which was one of four aircraft hijacked during the September 11 attacks in 2001. The memorial is located in Stonycreek Township in Somerset County, Pennsylvania, and is southeast of Pittsburgh and west of Philadelphia. A national memorial was created to honor the passengers and crew of Flight 93, who stopped the terrorists from reaching their target by fighting the hijackers. A temporary memorial to the 40 victims was established soon after the crash. The first phase of the permanent memorial was completed, opened, and dedicated on September 10, 2011. The design for the memorial is a modified version of the entry Crescent of Embrace by Paul and Milena Murdoch. A concrete and glass visitor center opened on September 10, 2015, situated on a hill overlooking the crash site and the white marble Wall of Names. An observation platform at the visitor center and the white marble wall are both aligned beneath the path of Flight 93. United Airlines Flight 93 Of the four aircraft hijacked on September 11, 2001, United Airlines Flight 93 is the only one that did not reach the hijackers’ intended target, presumed to be the United States Capitol in Washington, D.C. Several passengers and crew members made cellular telephone calls from the plane and learned about the attacks on the World Trade Center in New York City and the Pentagon in Arlington County, Virginia. As a result, the passengers and crew members decided to mount an assault in order to retake control of the aircraft from the hijackers. The plane crashed in a field in Stonycreek Township about northwest of Washington, D.C., killing all 44 passengers and crew members, including the four terrorists. Temporary memorial The crash site was enclosed by a fence and closed to the public except for victims' family members. The temporary memorial was located on a hillside from the crash site. The memorial included a chain-link fenceits length commemorating the 40 passengers and crewon which visitors could leave flowers, flags, hats, rosaries, and other items. The items were collected by the National Park Service. Many cities wanted to memorialize the heroes of United Flight 93. Among the first was Marshall, Texas, which by order of the City Commission, named a street "United Flight 93" in early 2002. The keynote speaker was Barbara Catuzzi, the