defensive walls the prussian fort one largest fortification systems europe fortress nysa |
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| navigate by keyword : ancient archaeology architecture blue brick building castle city construction courtyard culture defense defensive estate europe fort fortification fortified fortress grass heritage hill historic historical history landmark largest memorial monastery monument nysa old one opolskie outdoor panorama plant poland prussian rock ruins sky spring stone stonewall stronghold structure systems terrain tourism tower travel tree wall walls |
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| Defensive walls of the Prussian fort. one of the largest fortification systems in europe. Fortress of Nysa. |
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