Rarely mentioned these days is a pilgrim ritual that has died out, it seems. A pretty
old booklet, written in Latin, has this to say in an English translation:
The mountain is eight miles up, and eight miles down the other side, and seems to touch the sky. Climb it and you'll feel you could push the sky with your hand. The view from the summit takes in the Sea of Brittany, the Atlantic Ocean, and three territories: Castille, Aragon and France. On the summit is a place called Charlemagne's Cross, because here Charlemagne, setting out with his armies for Spain, made a track with axes, picks and other digging tools. He first raised a cross and then knelt facing Galicia and poured out prayers to God and St James.
And so it's traditional for pilgrims to kneel here facing St. James' homeland and to plant their own crosses. You might find a thousand crosses here, the first station of prayer on the Camino de Santiago.
I didn't see a single cross planted near that place. Never saw a photo that would confirm that it is a contemporary ritual. I think people don't do this anymore ...