Is this the real world location Castle Refuge is based upon?
9o% sure all signs point to yes...
It is based on a real world location. I want to say you are right, and there is at least one interview floating around that confirms that.
Yeah, it's there. It's incomplete, and it actually looks worse than that picture, but it's there.
Cool. If a map is based off something real, it gives a good anchor point for major terrain features. Then spin the clock forward a few hundred years and see what you get :-)