For Brave New World.
Earth in the present day. Play as one of 24 nations as you compete for dominance in the modern age. Includes 7 new technologies, 2 additional unit classes (and 20 new UUs), 5 new building classes (and 9 UBs), 4 scenario variations, and more.
Technical Note: Requires Brave New World and Korea DLC
Don't have Korea and don't want to buy? See the first post in the discussion thread (link below).
Installation: Extract to your MODS folder (standard location: Documents/My Games/Sid Meier's Civilization 5/MODS)
Setup: After loading the mod, select "Custom Game" and then choose whichever of the four scenarios you wish to play.
Downloads: The link above goes to Game Front. Alternate hosting sites are linked to below.
Steam Download Page