I'm not sure if I'm the first person to notice this but I didn't see a post about it already. Someone had posted a video of uninstanced Gundrak which showed all of the altars and keystones in the room. I went there myself today to check it out and came across something rather cool.
The alters that you would normally click are indeed clickable and perform the appropriate animation. Interestingly enough, the center keystones are also clickable, but only in flight form and only from the very center of the circle where there is no ground. For what ever reason though, when clicked they become magical flaming jumping keys that fly into the air while on fire, reattach themselves to the above hanging ropes, and then fall back into position. Its rather neat and a good way to kill a few minutes while exploring under Northrend.
Edit: A really crappy and short video of the jumping stones:
YouTube - Jumping Statues of Uninstanced Gundrak