The daddy of strategy gaming, Civilization, is back in it's fifth installment and promises more advancements than just the introduction of hexagonal play.
Here are two official wallpapers, one featuring the game's logo and the other Otto von Bismark, one of the game's characters. While two images aren't many, Take-Two have sensibly made them available in pretty much every resolution you might need. No monitor is too big or small for these!.
Civilization V is scheduled for release in autumn 2010, and will be preceded by a demo in September.