#11 Kingdoms of Amalur: Reckoning
38 Studios may have gone under, but the world they crafted remains one of the biggest and best designed open worlds to date.
The game is set in the Faelands, one of the so-called Kingdoms of Amalur and home to the Fae. The Faelands are divided into separate regions, including the forests, plains, canyons, marshes, and the crystal kingdom of Alabastra.
Had the developer that made the game not shut its doors, we'd be looking at a sequel to Kingdoms of Amalur that would've been set in one of the other kingdoms. 38 Studios even had an MMORPG planned, which would've encompassed all the kingdoms in the game, including the one we get to explore in Reckoning.
With any luck, someone else will pick up the license and put to use all the resources and lore they developed for the setting.