Merkers Adventure Mines

50°49′11″N 10°07′25″E / 50.819595°N 10.123605°E / 50.819595; 10.123605

Merkers Adventure Mines are a visitor attraction in Krayenberggemeinde in the Wartburgkreis district of Thuringia, Germany, owned and operated by K+S AG of Kassel. They lie near the village of Merkers.

The mines have a long history of salt extraction, and hold the record for concealing large amounts of Nazi gold during World War II. A hundred tons of gold and many works of art presumed to be stolen were discovered by the liberating United States Army in 1945.

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The Merkers Mine drops 860m below the surface into the 'Werra-Revier' band of potash bearing salt. There, at a constant temperature of 28C, are 4600 kilometers of tunnels.^[1] Visitors are lowered in the hoisting cage at over 10m/ sec (30 km/h) down to the 500m galleries. There they are driven on 20-kilometre long tour of the mine, seeing an underground mining museum, a room where in 1945 the 'Gold und Devisenreserven der Deutschen Reichbank' dubbed the Nazi gold was stored, the world's largest underground bucket-wheel excavator, simulated blasting and a laser show in the world's largest underground concert hall.^[2] Also, in 1980 a crystal grotto was discovered. Here visitors see enormous salt crystals, some over 1 m in size.^[3]