I absolutely loved exploring the Fiery Furnace in Arches NP! I will say, it could be a little intimidating, because you have to obtain a permit for it, and they have a safety and informational seminar with you before you begin. It indeed is a bit of a maze, and I would be lying if I said I didn't get a little bit lost in here 😅 If you don't wish to explore it on your own, though, they do guided tours!