Jasenovac concentration camp
Inside the camp, there was no sanitation.  Prisoners had no way to keep things clean, and had to live in terrible conditions.  Blood, vomit and dead bodies filled the barracks.  The barracks were also full of pests like lice and rats, which spread disease.  The barracks smelled terrible because inmates had to use a bucket for a toilet during the evenings.  The bucket often spilled.