Wool and the olive harvest Historical milestone · Arévalo de la Sierra, Almarza, Soria Image of Arévalo de la Sierra, not of the place itself. During the 19th and 20th centuries the economy of Arévalo de la Sierra combined the export of wool and livestock raising with the growing of wheat and rye, and with the crews who went down every winter to pick olives in Andalusia and Extremadura. siglo XIX Photo: Jonroman (CC BY-SA 4.0) What to see and do in Arévalo de la Sierra