Spain is Top1 country in the world (USA is 2nd) in Nature Reserves, aka wild semiprotected areas:
https://www.spain.info/en/query/spain-biosphere-reserves/Just google images each one to find the one that their landscapes suits you the most.
Spain also holds 50% of all fauna and flora biodiversity of all Europe. So, jjst go to rural Spain and you will find what you want. Maybe Picos de Europa or Pirineos or Cabo de Gata, etc
https://www.spain.info/en/query/spain-biosphere-reserves/