Humberstone Saltpeter Works, UNESCO World Heritage Site, northern Atacama, Chile, South America

humberstone saltpeter works atacama desert chile industrial ruins rusty metal corrugated metal buildings structures tower sky blue sky sand dust landscape desert dry arid remote ghost town history industry mining extraction production processing nitrate saltpeter mining town settlement heritage tourism travel architecture industrial architecture ruins abandoned forgotten derelict weathered weathered metal corroded erosion decay deterioration preservation cultural heritage natural beauty contrast dramatic