I reckon I know the local woods as well as anyone; even better than most. But a few days ago my friend José took me to see the above.
We live right on the cusp of 3 departments (counties). The Dordogne, The Lot, and The Lot et Garonne; the latter being just a couple of hundred metres away from my front door.
Amazingly, this small concrete borne, with a cross on top, represents the highest point in the whole department of The Lot et Garonne, something I was quite shocked to discover as it is just a short leap inside their boundary. It doesn't mention the height, nor is it a nicely fashioned piece of stone. Just a lump of concrete with a X marking the spot.
I can stand on it, look south, and see the whole department beneath me (if it wasn't for the trees in between).
That same afternoon I came across yet another strange concrete object that I'd never seen before. This time slightly less interesting.
Under this circular concrete cover is some type of pressure valve, which releases air from a very comprehensive system of pipes that deliver water to our local farmers. Although it is just a hundred metres from our house, I had no idea it was there.
One never ceases to discover; and I hope that continues.