In Walim (german Wüstewaldersdorf), southwestern Poland, a satellite camp for prisoners who worked as slaves in the tunnel complexes (anlage Riese) built by the Germans was established. 1943. The camp was located within an existing factory area.

Current status: Demolished (2013).

Location: 50°41'50.09" N 16°26'42.06" E

Get there: Car.

My comment:

The ruins are still there and off limit, but the fences that exist are ignored. However, it is important to be vigilant when entering the ruins, cracks and absence of guardrails can be fraught with danger if you stumble or take a wrong step.

Follow up in books: Kogon, Eugen: The Theory and Practice of Hell: The German Concentration Camps and the System Behind Them (2006).