Although we specialise in older features, non-invasive prospection has a great potential in the study of much younger topics. As an example, we carried out a small GPR survey within the historical Annaberg Calvary, a place of continuous religious pilgrimage as well as a site of Silesian Uprising battle in 1921 and forced labour camp during WW2. Time-slices derived from our GPR readings located a shallow lying linear feature (visible at the top of the animation plot) that can be linked to a possible (exterior) wall of the Annaberg forced labour complex.