In a small deviation from the path, there is easy access to the ruins of the old San Mamés hermitage, surrounded by several shelters for cattle in several caves.
It is an interesting hermitage complex in the La Horadada gorge. Next to the road there is a stream and on both sides of it, a curious set of caves and galleries.
Caves dug into the road from Trespaderne to Oña. A very cool place whose origin is unclear, whether they were used to shelter nomads or as cells for monks.