My wife and I will be driving back to Calais from the south of France in late June. Our plan is to stop off in Reims for a day to break up the journey. We want to visit the cathedral and a champagne house/vineyard. Whilst we are in the area, I feel we should also pay our respects to those who lost there lives in World War 1. Are there any interesting WW1 sites near Calais or near the route between Reims and Calais?