Ancient stone kiln in a rural field with a dry stone wall and overcast sky, North Yorkshire, England, United Kingdom, Europe

Old stone lime kiln on a grassy field with a cloudy sky, path leading to the historical structure, North Yorkshire, England, United Kingdom, Europe

Old kilns for processing mercury, Mineral de Pozos (Pozos), a UNESCO World Heritage Site, Guanajuato State, Mexico, North America

Historic Puntenney Kiln in Prescott National Forest, one of few relics left of the ghost towns of Puntenney and Cedar, Arizona, United States of America, North America

Old kilns for processing mercury, Mineral de Pozos (Pozos), a UNESCO World Heritage Site, Guanajuato State, Mexico, North America

The Charcoal Kilns, bee-hive structure, designed by Swiss engineers, built by Chinese labourers in 1879, Panamint range, Emigrant Canyon Road, Death Valley National Park, California, United States of America, North America

Old kilns for processing mercury, Mineral de Pozos (Pozos), a UNESCO World Heritage Site, Guanajuato State, Mexico, North America

South Stone Kilns, old kilns used to calcine the ironstone mined in Rosedale in the North York Moors, Yorkshire, England, United Kingdom, Europe

Santa Laura Saltpeter Works, UNESCO World Heritage Site, Atacama Desert, northern Chile, Chile, South America