Where do you put the dragon priests masks after you get all of them? I've played for hundreds of hours but I don't know where you put them.

Other than storing them in a safe container, there really isn't any place to put them. I mean, you could just drop them somewhere, but I think the Wooden Mask disappears if you drop it and leave the cell, so it's not like you can place it on a shelf somewhere. Don't know about the others. But as far as putting them out on display there's really no place for that in any of the player homes unless you mod it in. (Unless the Hearthfire homes include something for it, that I don't know as I don't have it.)

I mean where's the shrine to put them in after you get all of them? What's a Wooden Mask?