The Ofenkaulen are a tunnel system in the Siebengebirge, two kilometres east of Königswinter, which was created by the mining of tuff stone for oven construction in Königswinter. The Ofenkaul mountain on the south side of the Mirbesbach valley opposite the Nonnenstromberg is named after it. Entering the cave system, which is under nature conservation, is prohibited due to the risk of collapse.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
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Address: Rhein-Sieg-Kreis, Germany
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