There are some strongholds built to protect the sacred, like an impenetrable wall, an intimidating fortress, or a mystical river. But there are others used for more sinister purposes. We
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There are some strongholds built to protect the sacred, like an impenetrable wall, an intimidating fortress, or a mystical river. But there are others used for more sinister purposes. We uncover the remarkable stories behind some of the world's most imposing structures.
