Something that feels like an impossibly twisted maze is labyrinthian. Don't worry, you'll get the hang of your labyrinthian new school, with its endless branching hallways and staircases!
You can also use the slightly more common adjective labyrinthine for places that are so complicated and confusing that you feel like you'll never find your way out. These labyrinthian locations can be corn mazes, doctor's offices, or underground caves. The Greek root labyrinthos refers to the ancient myth in which Daedalus built a maze (or labyrinth) to contain the monster known as the Minotaur — it was so complex, that Daedalus himself could barely escape!