The mines and mills of France's Ardennes region
There's not a red tile or thatched roof in sight across France's Ardennes region. This border region with Belgium is instead covered with the grey tones of slate, which was mined here from the Middle Ages until 1971. The region is also famous for its forests and sawmills, as well as a mill that's home to the last remaining natural pigments factory in France. Finally, the poet Arthur Rimbaud was born in this area - and still continues to receive fan mail, over a century after his death.