Must’ve been a piece of work to build. But notice the water pipes and valves. That cliff face has been extensively engineered. I wonder if it’s reasonably accessible from the top. Could be that this is a canyon climb going up to a plateau.
That path (without the concrete, of course) has probably been there at least since the time of the Romans if not before. It does look as if something had been done in the last century or so to bring water down, but it’s possible that before that, the path was used as a shortcut by individuals sent up the hill for some work-related reason or by herders. I was in the Pyrennees once and saw a path like this, although it hadn’t been “improved” and was just a set of narrow shelves of rock, literally only a few inches wide, that ran into a deep valley - and there was a local calmly meandering along it.
I was wondering how many people they lost when they built this one! Pre-OSHA...