Finished in 1943, the Pentagon is a symbol of U.S. military might. It's also one of the places attacked on 9/11.
Work started on a memorial to those killed in the Sept. 11 attacks in 2006.
Brad Barket/Getty Images
Ilia Yefimovich/Getty Images
Christopher Polk/Getty Images
Thierry Chesnot/Getty Images
Robert Evans/Handout via Getty Images
Win McNamee/Getty Images
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