Powerful looking Dover Castle. Its entrance along the landward side is pretty cool. Built up from the ground so that the walls on the top of the slope create a natural moat, an almost unscalable slope. Using siege towers would be almost impossible. taking it would require scaling ladders and a great many men.
Very defensible. But even if you broke through the other walls you'd have a second slope and set of walls to break through and then an inner keep.
Whatever Barons dwelt here were secure I suspect.
Its where you want to be when the zombies attack.