What are/have been the most impregnable fortresses in history? - Quora
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What are some of the best fortified historical fortresses in your opinion? - Quora
What are some of the most imposing castles around the world? - Quora
At what point in history were castles the best built and strongest? - Quora
What are some of the most impressive and impregnable fortresses ever conceived by fantasy writers? - Quora
At what point in history were castles the best built and strongest? - Quora
What are the most impenetrable castles in the history of Great Britain? - Quora
Which is the strongest Fort in the world? - Quora
What are/have been the most impregnable fortresses in history? - Quora
What are/have been the most impregnable fortresses in history? - Quora
What are the most impressive castles and forts still standing? - Quora
