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The Pentagon - Wikipedia
U.S. Department of Defense
Pentagon Tours - U.S. Department of Defense
Pentagon ‑ Location, Building Timeline, 9/11 - HISTORY
10 Things You Probably Didn't Know About the Pentagon
Pentagon | History & Features | Britannica
Why Is the Pentagon a Pentagon? | Smithsonian
Historical Office > DOD History > Pentagon > History
How the Pentagon’s Design Saved Lives on September 11