Bran Castle doesn't need that-- Bran Castle is "cool" as it is.
Yet, for all that, we always have in our mind the place where Bran Castle is: Somewhere far North, near Bistritsa. Which is as you can see below incorrect. While Bistritsa is further north, Bran Castle is not. Still it is in Transylvania.
To put this correctly, Brasov is the nearest city to Bran Castle.
As you can see it is closer to the border of areas of what were Wallachia and Transylvania. Perfectly located to defend against incoming invaders from the East.