During the height of the Triangle Trade, Europeans built a lot of forts to protect their interests along the Gold and Ivory Coasts; why these forts are considered castles by this site is beyond me (just for clarification: a castle is a fortified private residence).

Edit: I now realise that the site specifically says "Map of the world's great castles & fortresses", so I guess the site considers them fortresses, not castles. I retract my snark.

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