Fiets,Passchendaele was where my 16 about to be 17 year old grandpa was careless and lost one of his legs. All those big WW1 battle field areas have scores of cemeteries around, all those poor young guys thrown into that mess.
Friends of ours biked through that area this summer and had to avoid the "red zones", the areas so filled with artillery shells shot into that 100 years later they are still off limits.