When I was at school, one of the girls in my class brought a load of photos in that her grandad had taken when they liberated a prison of war camp, it was for a project or something she was doing. In those photo's there was also a bull dozer, would it be the same camp or were all camps run the same way? tbh it hit us kids...seeing it in books doesnt really mean much at that age as your constantly looking in books but, to hold a actual photo that some one had taken at the scene brought it all to life and gave it depth.