Mods

Now that Civilization V has had a few years to mature, it's gone from Civ IV's scrawnier younger sibling to a full-grown adult (it's even shaving now, we hear). Firaxis' official patches and expansions—Gods & Kings, and now the Brave New World expansion — has done a lot to help fill-out Civ V's feature set, but the amazing modding community has also been twisting knobs and adding content, with over 1500 mods available on Steam Workshop.

Civilization 5 - Avatar Mod

This mod adds the four civilizations from the Nick show, Avatar: The Last Airbender

Celtic civilizations mod

A mod of Ice and Fire (Game of thrones mod)

LS Civilizations pack mod

More luxuries mod

The Elder Scrolls Online Mod

Prehistoric era mod