Close to Sarche are several climbing crags. One of them is Sisyphos. The access description in the topo guide said something of a large rock to the left. Well don't imagine of something huge, more of something bigger then the usual rocks next to the road. When going up, you will see the name Athos written on the rock, don't follow that. The crag is not far anymore. And it's nice in the shade, the rock is still in good conditions.