13. World of Warcraft: Cataclysm
World of Warcraft may have seemed like a big game for its time, especially in contrast to competing MMORPGs like Guild Wars and Lineage 2. Azeroth is a big, sprawling world, but it paled in comparison to Outland, an all new land introduced in the Burning Crusade. Players could soar through the air in flying mounts and behold the vastness and majesty of all the environments of Outland.
Azeroth too was reshaped in its entirety with the release of the latest expansion pack, Cataclysm. As the initial design did not allow for flying mounts, all of these locations had to be redesigned, and vastly expanded in size and scale.