Well, there's a niche genre of so-called "Dungeon Core" books, usually a subgenre of the also niche LitRPG genre, where the main character is just that, a dungeon, usually a former human soul that got turned into the core of a dungeon but not always, more books than i expected when i heard of it for the first time not too long ago, i guess that needed it's representation on tabletop RPGs