From what I have gathered, this place used to be a tournament ground of sorts, where warriors from throughout Pandaria would show their prowess by following in the footsteps of their last emperor, Shaohao.
I have heard that when Shaohao completed his trials, he became one with the land, and enveloped Pandaria in a thick mist, obscuring it from even our abilities to penetrate the passages of time.
That sounds quite interesting, perhaps you should speak with him?
In my pride, I sought to keep Pandaria a secret, and once again I have found myself learning great lessons from this land. I am glad to be able to share my stories with my people, once again, in that they may learn as I have, and learn from my mistakes. Perhaps you, too, can still learn a thing or two from the lessons of Pandaria.