The Guardian has a good article about not just GOT but history of modern fantasy and their settings. Author uses Tolkein as a spring board. I did not know Dungeons and Dragons was set in a dying Earth thats Wolfe influenced. So would Dragonlance and Forbidden Lands (?) be also on a dying Earth since I believe both are D and D influenced? Author mentions also Thomas Covenant and how its not clear if the fantasy world is real or in his mind. Not listed is the excellent Kushiel series set on Earth but in an alternate history.