Ключевые слова: architecture, army, attack, battery, battle, blue, building, bunker, cannon, coast, concrete, construction, czech, darkovicky, defense, dirty, europe, fort, fortification, grass, green, gun, hidden, historic, history, invasion, landmark, landscape, metal, military, nature, occupation, old, protection, republic, ruin, safe, safety, second, secret, security, steel, stone, structure, underground, wall, war, world,