TRAVELTSA museum showcases somber historyThe current exhibit at TSA headquarters, entitled "Never Forget," features artifacts related to Sept. 11, 2001.Courtesy TSAIndiana limestone recovered from the exterior walls of the Pentagon.Courtesy TSAA metal detector which screened hijackers on the morning of Sept. 11, 2001.Courtesy TSAThe first American flag to fly over Terminal B at Boston Logan Airport when the airport was federalized in 2002. American Airlines Flight 11 left from Gate 32 in this terminal on Sept. 11, 2001.Courtesy TSAA piece of interior support steel and a section of subway rail from the World Trade Center.Courtesy TSAA piece of aluminum alloy sheathing which covered the exterior columns of the World Trade Center towers.Courtesy TSAClose up of a subway rail recovered from the destroyed PATH station at the World Trade Center.Courtesy TSAAn original handheld metal detector used by TSA at Washington Reagan National Airport in 2002.Courtesy TSASome of the artifacts donated to the Smithsonian by the TSA Historian Project in 2011.Courtesy Of The Smithsonian InstitutionFeatured Weekly Ad