The Pentagon is the largest office building in existence. The structure was completed on January 15, 1943, during the height of the Second World War, after a crash building effort of only 16 months. The 83 million dollar facility covers more than six million square feet, roughly three times that of the Chicago’s Sears Tower (the second largest office building). Originally a US Army facility, it soon became the nerve center for all military branches of the United States.

Civilization III

Main article: Pentagon (Civ3)

Civilization IV

Main article: Pentagon (Civ4)

Civilization V

Main article: Pentagon (Civ5)

Other games

Pentagon is not present in (or the article has not been created for) the following games :

Game Article
Civilization VI Pentagon (Civ6)
Civilization: Beyond Earth Pentagon (CivBE)
Civilization Revolution Pentagon (CivRev)
Civilization Revolution 2 Pentagon (CivRev2)
Freeciv Pentagon (Freeciv)
Civilization: Call to Power Pentagon (CTP1)
Call to Power II Pentagon (CTP2)
C-evo Pentagon (C-evo)
FreeCol Pentagon (FreeCol)
Sid Meier's Alpha Centauri‎ Pentagon (SMAC)

Not in the following games

It has been confirmed that Pentagon is not present in the following games :

Civilization II
Civilization IV: Colonization

Future Technology (CivRev)
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