If you want to see something that hits you hard into reality. There are some surviving satellite camps of Mathausen on the Austrian/Yugoslavian border. They were left alone as they split the border, thus the camp was essentially left alone since it was liberated and the burn pits where the bodies were disposed of still have human fat left on the walls. I never meant to go to this camp because it was so out of the way and I’ve been to about 30 of the camps already. It a sobering reminder on what happens when tyrannical govt’s come to power. The only camp that I’ve been to that was worse then some of the main camps is Jasnovac in Croatia, the SS shut it down because it was to brutal. The camps were run by Franciscan priests who were pro Croatian.
The Tunnel at Loibl Pass written by Andre Lacaze is about one of the satellite camps if I remember correctly.