journeypentagon travel officeShare on FacebookShare on Twitter353IMAGESPentagon History: 7 Big Things to Know > U.S. DEPARTMENT OF DEFENSE > StoryThe Pentagon; World's Largest Office Building & The Defense Department Of USAThe Pentagonpentagon office: Pentagon's 80 years of dominance is over! Surat now home to the world's biggestPentagonPentagon Facts You Never Knew Until Now
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