Slate Museum
Haut-Martelange
Experience the world of the 20th-century slate industry. Explore the underground extraction chambers up to 42 metres deep, and discover the industrial, administrative and residential buildings of the time.

Programme
Saturday, 20 May 2023
Art Exhibition
QIENBOI Event
11:00 – 18:00
As part of the QIENBOI event, four Belgian artists – Laurent CLINQUART, Gilliane WARZEE, Alex KREISMAN, and Christophe PIETTE – will exhibit their works at the Slate Museum.
Underground Tour
Self-guided visit of the underground mine 'Johanna' (-42m)
10:00 – 18:00 (last descent at 16:30)
LU, FR, DE, EN
Majestic chambers, mystical water plains, ancient treasures…
Immerse yourself in the underground working world of the Leekëpperten, following a walking trail of approx. 370 steps, descending to a depth of -42 meters.
Suitable for children aged 4 and up. Sturdy shoes and a jacket are necesssary.
Booking required (specific and limited time slots):
📞 +352 23 640 141 / ✉️ info@ardoise.lu / 🌐 webshop.ardoise.lu
Industrial Train Ride
13:00 – 17:00 (weather permitting)
LU, FR, DE, EN
Explore the 8-hectare museum site above ground on boaerd of an industrial train.
No booking required.
Blacksmith Demonstrations
10:00 – 17:00 (LU, FR, DE)
The blacksmiths will showcase their impressive craftsmanship.
No booking required.
Evening Concerts (after museum closing at 18:00)
AntiDOT & AI Wellens Band – QUENBOI Event
19:00 – 23:00
As part of the QUENBOI event, two concerts will take place at the Slate Museum.
No booking required.
Sunday, 21 May 2023
Underground Tour
Self-guided visit of the underground mine 'Johanna' (-42m)
10:00 – 18:00 (last descent at 16:30)
LU, FR, DE, EN
Majestic chambers, mystical water plains, ancient treasures…
Immerse yourself in the underground working world of the Leekëpperten, following a walking trail of approx. 370 steps, descending to a depth of -42 meters.
Suitable for children aged 4 and up. Sturdy shoes and a jacket are necesssary.
Booking required (specific and limited time slots):
📞 +352 23 640 141 / ✉️ info@ardoise.lu / 🌐 webshop.ardoise.lu
Guided Underground Tours
10:30 – 12:30 (FR)
14:30 – 16:30 (LU)
After a brief introduction to the history of the old slate quarries, you'll descend into the mine to a depth of -42m (approx. 370 steps in total) and learn about slate extraction and transportation.
Suitable for children aged 4 and up. Sturdy shoes and a jacket are necessary.
Booking required (specific and limited time slots):
📞 +352 23 640 141 / ✉️ info@ardoise.lu / 🌐 webshop.ardoise.lu
Industrial Train Ride
13:00 – 17:00 (weather permitting)
LU, FR, DE, EN
Explore the 8-hectare museum site above ground on boaerd of an industrial train.
No booking required.
Blacksmith Demonstrations
10:00 – 17:00 (LU, FR, DE)
The blacksmiths will showcase their impressive craftsmanship.
No booking required.
Informations pratiques
Contact
(+352) 23 640 141
Opening hours for the Luxembourg Museum Days
Saturday 17 May 2025, 10:00 – 18:00
Sunday 18 May 2025, 10:00 – 18:00
Free entry