The sun is setting on The Wall, followed by the comet that signalled the return of the dragons (or R'hllor, depending on your beliefs). I can't see the end of the astonishing mix of ice and wood and stone that protects Westeros from the Others: it vanishes into the distance. I'm so high up that Castle Black below, that seemed so big when I arrived, is hazy and distant and small. I've had to turn off the clouds to see the ground. Someone's finally built Westeros, the nasty fantasy world that the books at TV series A Song of Ice And Fire is set in, the way the fans want it built, and you can visit it in Minecraft.