Yep. Winterfell is where Winter (i.e, the Others) Fell. Brandon the Builder built it with the help of the Giants and the Children of the Forest, around the same time he built the Wall. My guess is that Winterfell came first, because you don’t need Winterfell if you have the Wall. (although it could be a Plan B)

Consider certain things about Winterfell: it’s got two massive walls, with the inner having more guard towers than the other; the outer wall is lower than the inner wall, and there’s a giant moat between the walls, not outside the first wall. This is really, really weird as castle-building goes. As far as I can tell, there’s only one reason you’d build it that way (and no, I don’t think the outer walls were built later – the Maesters are wrong about that): because you’re preparing to fight an enemy that you know will not break, will absorb all the losses you can throw at it and swarm over the walls, so that you’re already thinking about fighting at the second line. 

Then add on to it that the whole castle is built around a godswood with a big fucking weirwood tree at the middle, and right on top of giant hot springs that have been piped into the walls so that no matter how cold it gets, the people inside will stay warm and alive. 

Then add on to that this: 

”hot springs such as the one beneath Winterfell have been shown to be shown to be heated by the furnaces of the world – the same fires that made the Fourteen Flames or the smoking mountain of Dragonstone…the smallfolk of Winterfell…claim that the springs are heated with the breath of a dragon that sleeps beneath the castle,” and that “the dragon Vermax left a clutch of eggs somewhere in the depths of Winterfell’s crypts, where the waters of the hot springs run close to the walls.”

Winterfell is not so much a building as it is a giant engine for fighting the Others.