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

humberstone saltpeter works atacama desert chile abandoned ghost town industrial factory building rusty metal corrugated weathered desert landscape arid dry barren fence wood remnants ruins history heritage mining industrial revolution 19th century 20th century south america travel tourism culture architecture remote desolate harsh environment abandoned buildings industrial site chilean landscape atacama region humberstone town forgotten history saltpeter mining mining industry desert scenery forgotten place historical site tourism destination unesco site