(FILES) This file photo taken on February 28, 2017 shows the ruined church of the uninhabited village of Sarnago, in the northern Spanish province of Soria. Rural emigration in many areas of Castile region - where the village of Sarnago is located - as well as in Aragon and Extremadura regions was so massive in the 50s, 60s and 70s that their population density now rounds two inhabitants per square kilometer. A similar level to extreme regions such as Lapland or Siberia. / AFP PHOTO / CESAR MANSO