LotR: Realms in Exile is a mod for Crusader Kings III, featuring the world of Middle-earth in Paradox's great grand strategy game.
Four tiers of Gondor castle holdings.
Each design should be recognisable to those who follow The Battle for Middle-earth: The Age of the Ring.
ModDB link to the Gondor fortress in Age of the Ring.
Moddb.com
looks amazing *_*