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10 Things You Probably Didn't Know About the Pentagon
The Pentagon - Wikipedia
Pentagon Facts You Never Knew Until Now | Reader's Digest
Pentagon ‑ Location, Building Timeline, 9/11 - HISTORY
Pentagon History: 7 Big Things to Know - U.S. Department of Defense
Pentagon | History & Features | Britannica
9 Things You May Not Know About the Pentagon - HISTORY
Historical Office > DOD History > Pentagon > History
9 Amazing Facts About The Pentagon - Mental Floss
Why Is the Pentagon a Pentagon? | Smithsonian