Mauthausen was a German Nazi concentration camp on a hill above the market town of Mauthausen, Upper Austria. It was the main camp of a group with nearly 100 further subcamps located throughout Austria and southern Germany. The three Gusen concentration camps in and around the village of St. Georgen/Gusen, just a few kilometres from Mauthausen, held a significant proportion of prisoners within the camp complex, at times exceeding the number of prisoners at the Mauthausen main camp.
The Mauthausen main camp operated from 8 August 1938, several months after the German annexation of Austria, to 5 May 1945, when it was liberated by the United States Army. Starting with the camp at Mauthausen, the number of subcamps expanded over time. In January 1945, the camps contained roughly 85,000 inmates.
Wikipedia https://en.wikipedia.org/wiki/Mauthausen_concentration_camp
Official Website https://www.mauthausen-memorial.org/
Address (Unnamed Road), 4310, Austria
Coordinates 48°15'24.9" N 14°30'2.1" E