In reply to Alan James - Rockfax: thanks Alan, purely academic interest as not climbing here (this time).
The place I saw some belay bolts/chains was on the road to Formenter, from the road col on the way to the cap, there's a well constructed tourist path to a viewpoint. The gear was below the wall on that path, some looked old, some looked not too old. I guess it's banned there, too public (above).
The other place was the hill less than one km east of Castell d'Alaro. Lots of big steep stuff there but no idea if any climbs. Also huge rockfall there, scree slope covering the trees. I wondered how long ago that rockfall occurred.