Kohnstein, Mountain summit in Nordhausen, Germany.
Kohnstein is a gypsum rock mountain near Nordhausen, Germany, reaching about 335 meters at its summit. Inside the mountain runs a large tunnel network carved out over many decades of mineral extraction.
Gypsum extraction on the Kohnstein dates back to medieval times, giving the area economic value for centuries. During World War II, the Nazi regime took over the existing tunnel network and used it for secret rocket manufacturing with forced labor.
The mountain has served as a working landscape for generations, with gypsum extraction shaping both the terrain and the local economy. Today, visitors can observe how industrial activity left marks on the hillside that remain part of the area's identity.
Several hiking paths lead up the Kohnstein, and sturdy footwear is recommended for all routes. Access to the tunnel network inside the mountain is only possible as part of a guided tour, so it is worth planning ahead.
The tunnels inside the Kohnstein were not dug for military reasons but grew entirely from generations of gypsum mining. This makes the site one of the rare cases where civilian mining infrastructure was directly converted into a wartime production facility.
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