Every year, thousands of tourists travel to the northwestern corner of Castellón, a province on Spain’s Mediterranean coast, to visit some of Europe’s oldest and most plentiful cave paintings, dating back to the Stone Age. With rich images depicting archers hunting stags, boars and bears, as well as other scenes, the caves are now a UNESCO World Heritage site and have survived for millennia thanks to the area’s hot and dry weather — the same conditions that lured the world’s largest maker of blades for wind turbines to the area.