Hidden within a cavern within a sprawling mountain range, seated so high that it has never not been covered in snow, there is a temple.
Within the temple is a set of secrets that the world is not yet ready to know. For generations, that secret has been kept safe by various families from around the world.
Each family is chosen by a spirit that calls them to trek through the mountain, overcoming challenges to both prepare them for the challenges that lay ahead. It was also a test to prove to those who wait within the temple that these protectors are worthy of the task.
It is not an easy thing, to uproot ones life to begin anew in response to a calling you do not understand. But to answer this calling was to find oneself steeped in a life they could not imagine. So many impossible things happen within and around the mountain peaks.
Some say that the spirit was the first keeper of the temple, perhaps even the one who created it. If it has a voice, it has not used it for some time and the truth of where it came from only it knows. But the purpose it serves now is clear.
Once the new family is settled in to their duty, the spirit leaves and begins the search again for whoever will take up the mantle next. It roams the earth, taking care to watch and study those it thinks might be worthy until it is ready to give them the call.
Meanwhile, the previous family dedicates themselves to preserving the temple and uncovering those of its secrets that have been lost to the time and snow. They find pieces of the history of the place, unlock some of its secrets, and preserve what was left behind by those who came before.
They continue on in this magical world until the return of the spirit. Then they pack up their belongings and leave, letting the next family take over.
They take their memories with them, though try as they might they will never be able to find that place again. Unless the spirit returns to guide them home.