The Word Walls on the dragon mounts and some other exterior locations can be shown as, 'Cleared' if you collected the boss-level reward chest items, or at least took a look at them. I think that is what triggers most dungeons and locations to being cleared.
I've learned the word of power at them before I started the MQ, so Dragons hadn't started spawning yet. I only fought Dragon Priests, Draugr, and Hargravens at the walls. None of them show as cleared.
I've learned the word of power at them before I started the MQ, so Dragons hadn't started spawning yet. I only fought Dragon Priests, Draugr, and Hargravens at the walls. None of them show as cleared.
You have to kill the boss there, which is supposed to be a dragon.