All castles in Heroes 3.

Yeah, that's true. To be honest, I don't like Fortress.

Me neither. They're all so disgusting and green :) And plus, the fact that they have good defense doesn't help them. The only decent unit they have is the Gorgon; their high damage and deadly gaze do the trick...
Otherwise, Barbarians will defeat the Fortress faction with a 70-80% probability (no offense, Fortress players, but you're just not that good...).