2. The Elder Scrolls II: Daggerfall - 62,000 mi2Even though each successive Bethesda RPG seems to be getting incrementally bigger than its predecessor by a few measly miles, it's hard to see any of them reaching the terrifying scale of the second game in the series, Daggerfall. Sure, the majority of the world was just procedurally-generated wilderness, but you can't help but be a little bit in awe of it - it really doesn't look bad for a game of its time either. You could spend hours lost in the auto-generating Dragontail Wilderness, the Ravennian Forest, or in one of the game's endless number of labyrinthine dungeons - a single one of which could probably fit all of Skyrim inside it (not necessarily a good thing, given how confusing they can be). We'd probably say that procedurally-generating a giant world would be a bit lazy if Bethesda did it today, but the technological limitations of making a game in 1996 meant that this was the best way to create a convincing fantasy continent, which continues to far outsize any game in existence today.