Slowed down frame-frame best we could get: http://www.youtube.com/watch?v=DgPY0WoOqnE&feature=youtu.be

We used knockback / sage pulls to get up into the mountains and came across that place randomly. We couldn't get down into the cave since it was blocked entirely by an invisible wall - we did get a glimpse when we finally dropped down but nothing enough to say if there were cave paintings

We've had it quite a few times, although I've never viewed it as anything overly special since we've been running 4 man a lot. Only really took 1 screenshot, being: http://i.imgur.com/DtfOf.jpg We usually did this through a 2-4-2 tactic although it requires 3 healers, 2 tanks (or a tank-like dps) and some decent burst.