D31 between Exloo and Valthe
This hunebed is a mess. It fell a prey to stonerobbers a century ago. There is a report from 1822 that states that the hunebed was in perfect condition. Now only 6 sidestones, 2 endstones and 1 capstone are left. The remains of the barrow that covered the grave is still clearly visible.  
D31 is not so easy to find; it lies a few hundred metres from the paved road on a trail in the woods.