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These poignant drone pictures reveal the incredible human cost of The First World War - showing mass graves and the trenches and bomb craters which still scar the earth.

The images from 125ft up show the scale of the killing - with ranks of white grave markers on the the Belgian countryside. It also shows the Lochnagar Crater which marks the site of an explosion from a British mine beneath the German lines signalling the start of the Battle of the Somme.