One of the many mine tunnels in the Hunsrück, which were driven into the rock for ore, gemstone or slate quarrying. Most are closed by bars and serve as sheltered sleeping places for bats.
Once covered by a meter-thick layer of pumice, the 1,700-year-old tuff tunnels and shafts are now protected under the cantilevered hall construction of the Meurin Roman mine. The original traces …