23.08.2025 - 13.09.2025
Guided Tour: “The World of Slate – An Underground Journey of Discovery”
�� Duration: 2 hours
��️ Language: English (opt. German)
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��️ Price:. €15 (Adults), €12 (Seniors 65+ & Students), €10 (Teenagers 12–17), €8 (Children 4–11)
⚠️ For safety reasons, children under 4 years of age are not permitted in the mine. We recommend wearing a jacket and sturdy footwear.
�� Advance booking required (places are limited) : // +352 23 640 141 // https://webshop.ardoise.lu/exhibitions/overview
Step into a mysterious world deep beneath the earth’s surface.
This special guided tour takes you through the disused “Johanna” visitor mine — descending to a depth of 42 metres. You’ll make your way down over 370 steps into a fascinating underground realm of dark slate, past breathtaking man-made walls, thousand-year-old treasures, and mystical groundwater.
Accompanied by expert guides, you’ll discover captivating insights into the formation of slate, its significance for the region, and the hidden world that lies deep inside the mountain.
A journey for all the senses – mystical, cool, silent, and unforgettable.
Entrée principale, (CR311)
8823 Haut-Martelange
Saturday, 23 August 2025 - 14h30
Saturday, 30 August 2025 - 14h30
Saturday, 06 September 2025 - 14h30
Saturday, 13 September 2025 - 14h30
: 1.5€
T : +352 23 640 141