In 2016, my younger son and I visited the battlefields of the Western Front. From the Sunken Lane to Theipval, we were overwhelmed by the scale of loss. At one point he just stopped and stood in front of one young man's grave and talked to him for five minutes. I don't know what they talked about. The poppies blooming added to the poignancy of the tour.
October 2017 brought the opportunity to walk 100km of the Western Front. Walking is the perfect way to experience the scale of the frontline. It is slow enough to allow contemplation as each bend in the road brings another cemetery into view. It allows the scale to sweep over you. It gives you space to feel.