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The underground city Osówka is one of the most interesting underground complexes built by the Third Reich in the Owl Mountains as part of the RIESE (Olbrzym) project, which is now open to the public. The Osówka underground complex is located just over a kilometer north-east of Kolce and the same distance north of Sierpnica. The underground tourist route is a system of concrete corridors, fortifications and halls, which were built on a large scale in 1943, using workers and prisoners from the Gross-Rosen camp. The most attention is attracted by two facilities conventionally named "Casino" and "Gym". The "Casino" is 50 meters long. It has window openings, monolithic reinforced concrete alloy, fireplace pipes, installation pipes and internal insulation of chipboard. "Gym" is a concrete block, consisting of tanks and rooms to which hatches with steel clamps lead.