Ages ago, Bran set out to find the three-eyed-crow, the greenseer, who could help him to master his superpower. It was a long journey. On the way, he had a series of adventures. In this chapter, he successfully finds and meets the three-eyed-crow. How often does that happen in Game of Thrones, I ask? He didn't get kidnapped. He didn't become any more disabled than he already was. He didn't abandon his quest and go off and do something else. He didn't even change direction every chapter and randomly roam around the map getting distracted by various side-quests. He's gone in a more or less straight line from Winterfell to the three-eyed-crow. It has to mean something. Either Bran is the true hero of this series and is going to end up on the iron throne, or else this is GRRM's biggest dummy yet, and he's going to die in a freak boating accident in the next chapter.
In this chapter we meet a real life Child of the Forest, who talks and everything. And is over 200 years old ("Men, they are the children") so probably knows a thing or two. We also find out that the three-eyed-crow (who can't move on account of having tree roots embedded in his skull) has been spying on Bran and influencing his dreams ever since he was a baby. Oh, and either Hodor or Bran loves Meera; I'm not sure which. And Jojen is suddenly very weak; I don't remember why. Hopefully the underground colony of Children of the Forest can fix him up.