Three striking headframes from three different eras stand in the German Ewald coal mine, which closed its doors in 2000.
In the 19th century, the tentacles of the Walloon coal industry in Belgium reached deep into the German Ruhr area.
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On the occasion of International Art Nouveau Day, celebrated each year on June 10, a look at how this ornate architectural movement found its way into the most unlikely of places like coal mines, power stations, and railway yards and the long, sometimes heartbreaking battles to save what remains.
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