The past becomes the present as the true nature of the White Walkers and one of the show's most beloved character come into focus
Worldbuilding has always been a key pillar of the fantasy genre, and often plays a key part in the outcome of plots therein. George RR Martin’s fiction differs little from Tolkein’s or even Rowling’s in this regard; the Wall and Valyria will figure as much into the fate of our characters as Fangorn Forest or Hogwarts before it. But it is not just in geography that these fantastical worlds are built, but in history as well.