ARABA/ÁLAVA, SPAIN—Archaeologists have found evidence of viticulture in two of more than 300 known deserted settlements Araba/Álava province of Spain, part of the nation's northern Basque Country. One of the sites, Zaballa (or Iruña de Oca), was a feudal territory set up in the A.D. tenth century around a manor monastery. It was abandoned roughly 500 years later....