A girl places flowers at the Pentagon Memorial at its dedication on Sept. 11, 2008. Photo by Tom LeGro/PBS NewsHour All this week, we've been exploring where America stands 10 years after 9/11, from national security to…

Passengers at Los Angeles International Airport pass through security in 2010. File photo by David McNew/Getty Images When Denver International Airport opened in 1995, the city was particularly proud of the main terminal building. They spent a lot of…

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