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Construction on the Pentagon started on Sept. 11, 1941, in the midst of World War II. The five-sided design was chosen to accommodate existing roads around the building's original site near Arlington National Cemetery; a different site was ultimately picked, but the design was kept, according to the History Channel.
Finished in 1943, the Pentagon is a symbol of U.S. military might. It's also one of the places attacked on 9/11.
HART Executive Director and CEO Dan Grabauskas says the archival project is a small investment to help monitor construction activities.
As Air Force One landed in Estonia's capital Wednesday, the U.S. message to Vladimir Putin -- only 500 miles away in Moscow -- was clear: Stay put.
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