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Saint-Jean Engelsbourg Silver Mine, known as la Colonne Saint-Jean, is the largest man-made underground cavity in the Vosges Mountains. A particularly breathtaking cavity (180 cubic meters) reaching 120 m (394 ft) high. The Tellure Park offers to explore it by following the Via Ferrata. The Saint-Jean vein was discovered in 1549 by a miner named Collin Schwartz, who started the fever rush in the region.
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