It’s difficult to be completely sure what part of the garden this is from, but it’s probably the end of the gravel path going south from the front of the house into the woods. We know the gravel path at the front of the house extended both north and south, and it’s speculated that this was part of the original driveway to the front of the house (the present driveway goes to the back of the house). On the next photo it’s just possible to discern the wooden seat shown here.