Rogoźnica is a village in Lower Silesia voivodeship in southwestern Poland around 30 km away from Wałbrzych and 65 km from Wrocław mostly known for the Gross-Rosen force labor and concentration camp that was built there during the WWII by the Germans which was de facto the largest complex of death factories in Europe because it was not only limited to this camp in Rogoźnica but it was the headquarters and administration center for around 100 affiliated camps scattered around Germany, Poland and Czechoslovakia in various cities and for various purposes.
In Gross-Rosen itself there was around 40 thousand prisoners during the peak time which were prisoners of different ethnic backgrounds, nationalities and affiliations from almost every country in Europe who were exploited as workforce for the German war industry. Germans mainly sent skilled craftsmen and physically fit workers to this camp because its purpose was mainly to work for the German industry and factories.
The remnants of Gross-Rosen are sparse because the camp was destroyed by the German forces that withdrew in early 1945 but what's been left is well preserved and there is also a museum there where you can see permanent exhibitions and film shows about the history of the camp.
There is also an impressive stone memorial monument with built-in urns containing soil and ashes gathered in every affiliated camp of Gross-Rosen across Europe with the names of the given camp written on it as well as testimonials of the survivors of the death camp.
Near Rogoźnica there is a massive granite quarry that is in operation to this day, where prisoners of Gross Rosen were forced to work and where thousands of them perished.
Learn more about Rogoźnica in Poland on Wikipedia