For more, see the Creation and Customization forum and feel free to ask questions there. What are the different types of modifications and created content I can download? There’s a variety of material up for download. This includes user-made maps, scenarios, unit graphics, graphic modpacks ...
The nine of them are: Mesopotamia, Rise of Rome, Fall of Rome, Middle Ages, Mesoamerica, Age of Discovery, Sengoku, Napoleonic Europe, and WWII in the Pacific. Each Conquest has its own map, civilization, and units, and they all play out differently. Because they were made by Firaxis ...