The pinhal interior, a wooded region of hills and narrow hollows in rural central Portugal, used to be farmland. Well into the latter half of the past century, the fields were worked by peasants from the old stone villages. Portugal was poor and isolated, and the pinhal interior particularly so; when they could, the peasants left. There is electricity and running water now, but most of the people have gone. The fields have been taken over by trees. Each year the forest encroaches farther, and each year the villages grow more lonely. There are remnants of the earlier life, though,…