When you drive/cycle/walk on the road eastwards along the alignements de Kermario in Carnac, you'll soon see a sign pointing to the right : Tumulus de Kercado. There are standing stones around the mound, and also one on top of it. Inside you'll see carvings on the walls, that look much like the ones in Mané de Kerioned. In the ceiling there'a also a carving of an axe, similar to the one in Table des Merchands in Locmariaquer, about 10 km away.