Stunning network of carved WWI tunnels rediscovered in France

(via Daily Mail)  The momentos of allied soldiers who fought the Germans in World War I have been discovered inside eight miles of secret tunnels deep in the forests of Northern France.  The tunnels used by the American Expeditionary Force, sent to reinforce Britain and France, were recently discovered by an amateur battlefield explorer.  Pictures at the Daily Mail show how the recruits carved military insignias and portraits of themselves into the stone as they were holed up in a quarry they used for shelter from the relentless assault on the Western Front.