They were created by chemically dissolving the limestone. Since such cave formations only take place in areas filled with groundwater, these processes must have occurred at a time when the …
The Otto Wolff tunnel was started in 1935 to connect the Leopoldine-Louise mine to the Holzappeler mine. In civil engineering, the pit reached level 25 at 750 m below sea …
The Braubach lead and silver smelter, which today only scraps lead-acid batteries, has been an industrial monument since 2002. Mining has been going on since 1691 to extract lead, tin, …