Stutthof was a Nazi German concentration camp built in a secluded, wet, and wooded area near the small town of Sztutowo (Stutthof) 34 km (21 mi) east of the city of Gdańsk in the former territory of the Free City of Danzig. The camp was set up around already existing structures after the invasion of Poland in World War II, used for the imprisonment of Polish intelligentsia. The actual barracks were built in the following year by hundreds of prisoners enslaved in specialized commandos.