In DoF you'll start with a simple village and build up to a stronghold with several layers of walls and a keep inside, you can see it in the screenshots too. It's the "classical" castle set up and a well known fact about DoF although different races' strongholds will differ in types and strength of available defenses.
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The first duty of every Starfleet officer is to the truth, whether it's scientific truth or historical truth or personal truth! It is the guiding principle on which Starfleet is based! *Jean-Luc Picard*
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