PATRICK LANDMANN / SCIENCE PHOTO LIBRARY PATRICK LANDMANN / SCIENCE PHOTO LIBRARY
WWI tunnels under the Chemin des Dames, a ridge and plateau located in north-eastern France. This area was the site of several battles on the Western Front during World War I (1914-1918), in particular the Second Battle of the Aisne in 1917. The opposing armies at various times occupied and extended this ancient system of hundreds of kilometres of tunnels and caves (La Caverne du Dragon) dug from the limestone. Some are over 20 metres below ground. Carvings by French, German, American and Canadian soldiers from World War I, along with earlier artworks, have been preserved, and can be seen on guided tours.
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