The world of A Song Of Ice And FIre is the one for me. It got so many misterious places like stygai, ashaii and cracosa, with a lot of events happening at every moment. Plus the variety of the continents in both cultures and geography and things like that. From Westeroes with the knights and castles to Essos with the asian and african inspirations and lastly the mysterios Sothorios and Ulthos.