Solstheim when dealing with the game's expansion pack Dawnguard. Aside from the other Tamriel provinces, there's other continents on Nirn like Atmora, Akavir, Yokuda, Pyandonea, Thras, and Aldermis. If Bethesda ever decided to take the game to a different continent then I would LOVE to visit Akavir. It's a place inhabited by the Snow Demons of Kamal, serpent-men of Tsaesci, the Monkey People of Tang Mo, and the Tiger Dragons of Ka'Po'Tun. Along it being where the dragons in which the Akavari followed into Tamriel to hunt down and caused a huge war between the two continents. There's even an abandoned Imperial colony that was founded in Akavir.