Allee Couverte #2

So we were driving along somewhere between Cancale and Cape Frehal, and there was a sign that said "Allee Couverte" and we made an impromptu U-turn and found a place in the miniscule parking lot. We need to get a bumper sticker that says, in French, "this vehicle stops for megaliths." (Also cathedrals, museums, battlefields, scenic wonders, but that's probably a bit much). Actually, it was not a wonderful allee courverte, in need of some trimming, but still well worth the stop. If not the aftermath.

The sign; we never identified it further

Kind of tumbled-down, but recognizable

Thus

And thus

Running the length of the overgrowth, perhaps 60 feet; did I
mentioned the berries and plums on the hike in?

Some miles down the road, a fixer-upper chateau; we also stop
for those