They eventually rebuilt their towns and villages. One such place is called Rhunendin -- a mighty fortification that guards the western approach towards the Witch-king's old capital Carn Dûm. The Angmarim have continued to be faithful to their forsaken lord and serve his Steward -- Mordirith -- named the False King by the Hill-men, who also reside in Angmar. It's been a little while since we saw a focus on Angmar. Although, much like most of the Angmar zone, this is a place only reachable by players of the highest level in LotRO.
That's nothing new for massively games, but if you're a lowbie who really wants to check out some of these dark fortresses, there's always Monster Play.