Just over 50 “windows” carved into an almost sheer rock face at the Fos Ravine, just outside Bocairent in the Valencia region of Spain. They open out into as many, interconnected “rooms” behind them. For many years, the origins of these windows were unclear. The earliest proposed origin was that they formed the cells of a Visigoth monastery, though recent research suggests this is unlikely. Since about 2016 they are generally identified as granary stores of Berber origin. (You can find similar granary caves in the High Atlas mountains.) Originally these…