Update: Driving through Martelange (B, L) last week I made this snapshot of a deserted slate factory. There is some interesting information on the web. The factory is in fact also a complex of slate mines. The complex is inaccessible due to safety concerns. It’s official name was ‘Ardoisière Rombach’. It’s official name was ‘Ardoiserie Rombach’. More information on these websites: musée de l’ardoise and industrie.lu. For some background information on slate, and a cross-section of the mines: L’Ardoisière de Martelange. And finally, the Facebook page of the museum has some interesting pictures and information too.