Castle - Lawful Good
Rampart - Neutral Good
Tower - Chaotic Good
Conflux - Lawful Neutral
Fortress - True Neutral
Stronghold - Chaotic Neutral
Dungeon - Lawful Evil
Necropolis - Neutral Evil
Inferno - Chaotic Evil
Furthermore, if you follow the plot of the Campaigns closely, the heroes of different towns behave according to these alignments! Take the cunning and treacherous Sandro, weaving his intrigues — a typical NE. The cold-blooded Xeron, who kills his own soldiers on a whim, is a clear example of CE.
D&D experts, do you agree with me? :)