three different types of fences where installed in birkenau concentration camp

window vintage solution ruins rudolf road red prisoners poland old nazi museum krakow konzentrationslager hitler himmler heinrich guard germany german genocide gas final extermination europe defense death criminal cracow cracovia concentration complex cell camp buildings building bricks board blocks block birkenau barracks barrack barbwire barbed auschwitzbirkenau auschwitz auchwitzbirkenau architecture annihilation three types fences installed electricity electric protect protection