But this queue, I can't wrap my head around.  From what I've pieced together, the outside means essentially nothing.  Even 
@Alicia saying "gatehouse"- I need to get the exterior gatehouse out of my head.  The outside clearly isn't.  But the *Inside* will be.
I assume the bottom line is:
Outside = nondescript ruins
Inside = recognizable areas/rooms that we've gotten to via tunnels