From May 1940, there was a subcamp of the Mauthausen concentration camp in Gusen, wihich is only four kilometres from Mauthausen. The Gusen camp was similar in size to the Mauthausen camp. In Gusen, some of the prisoners had to work in quarries and some in the arms industry. Today, there are few remnants of the former concentration camp in Gusen. The town of Gusen is now located where the camp once stood.