@ 2ply Thanks and indeed. It's the variety that makes it fascinating.
@ Ewker The trail goes through these abandon villages. It's the GR5, GR171 and GR174 and some loops connected to these trails.
@ MAD777 Great you have been hiking the North of Spain. Especially March-May is a green-time in Catalonia. In the summer the Catalonia area can be very dry. Haven't been to the Cantabrian Mountains yet. It's on my shortlist.
@ mugs Hopefully you'll be able to walk this old path once with you wife!