Passchendaele, Belgium before and after the Battle of Passchendaele, 1917.
I was thinking of posting this, but it already was. So I reblogged it. There is almost not a better photograph to illustrate the hell soldiers and normal civilians went trough during WW1.
I always have to explain that the picture below consists solely of holes in the ground. It is hard to comprehend for young people that destruction in 1917 had this gruesome face. They always believe in a way that war before the Second World War was kind of childsplay.