The Diablo series is full of unique locations that make up the desolate world of Sanctuary, and Diablo 4 in particular showcases this world like never before due to its open-world design. While Diablo 4 already includes areas like the snowscapes of the Fractured Peaks, the marshes of Scosglen, and the deserts of Kehjistan, there are more locales around the series' world that future content could explore. One iconic location that a future Diablo 4 expansion could take players to is the High Heavens, but there would be some complications that might prevent Blizzard from going this route.