czechoslovak second world war fortifications the border barbed wire obstacle against infantry |
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| navigate by keyword : military bunker war architecture army old abandoned concrete building wall defense travel shelter protection historic outdoor nature underground fortification fort fortress landscape construction sky background forest nuclear europe security dirty interior structure door horizontal tunnel tourism stone dark metal corridor industrial danger battle czech republic ruin border secret hill empty weapon czechoslovak second world fortifications barbed wire obstacle infantry fence |
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| Czechoslovak Second World War fortifications at the border barbed barbed wire fence |
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