When Radmanthas the Crimson Necromancer failed (spectacularly) at his attempt to become a lich, his undead minions took up residence in his cliff-side estate. Guard towers and baroque statues flank the entrance to the columned antechamber. An underground river leads to a whirlpool where Radmanathas drowned villagers in sacrificial rites.
(EDIT: I somehow accidentally deleted the map from Photobucket. Consider that problem fixed!)