Half hidden underground on a hillside along the First World War battlefield in West Flanders, the German army built a reinforced concrete command post bunker.
Hidden deep in the woods near Verdun, France, lies Camp Marguerre, where the German army tested the use of concrete during the First World War.
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Once a year, the Arenberg coal mine and two abandoned railway bridges play a starring role during the passage of the spring cycle classic: Paris-Roubaix.
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