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.
A stone's throw from the Douamont fortress meanders the Boyau de Londres, a World War I trench.
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On November 9, 1989, the Berlin Wall, a symbol of Cold War division and oppression, was breached. Berliners poured through the newly opened checkpoints.
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