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152 1944 abandoned american architecture artillery atlantic batterie battery battle battlements beach bettery bunker cannon casemate castle channel cloud coast coastal color concrete conflict danger day dusk emplacement escape europe fort fortification fortress france german gold guernsey gun guns hard heavy hidden historic history hit island islands june kingdom longues mer metal military naval navy nazi normandy observation occupation ocean old omaha pillbox protection rounded ruin sea sky soldier strong sunset sur todt tourism tower united wall war wehermacht world