Finished in 1943, the Pentagon is a symbol of U.S. military might. It's also one of the places attacked on 9/11.
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.
Photo: U.S. Coast Guard
John Palminteri photo
Photo Courtesy: Mike Eliason / Santa Barbara Co. Fire Dept.
iStock / Terraxplorer
Antenne Réunion/linfo.re via CNN
Jim Rogash/ Getty
Jim Rogash/Getty Images
Scott Olson/Getty Images
Ilya S. Savenok/Getty Images
New York Magazine/Twitter via CNN
Bryn Lennon/Getty Images
Sign up to get Breaking News, Daily Headlines, Severe Weather Alerts & more delivered straight to your e-mail inbox
No email address was supplied by
To complete your registration on this site, please supply an address.
Please confirm or modify the email address to which you will have subscription offers sent.
For a more personalized experience, please supply the following optional information.