Many locations of key battles in the first world war were so ravaged by conflict that the landscape still bears the scars 100 years on.
By Ian Jones, MSN UK news editor. Image: Gerd Roth/DPA/AP 1 of 10
The Battle of Verdun ran for much of 1916 in the hills of north-east France. It was fought between German and French troops, and remains the longest battle in human history, with total casualties estimated to have numbered between 700,000 and one million.