The Humberstone and Santa Laura Saltpeter Works, located in the Atacama Desert of northern Chile, offer a fascinating journey into the country's industrial past as a UNESCO World Heritage site. These abandoned saltpeter refineries, once bustling with activity during the nitrate boom of the late 19th and early 20th centuries, now stand as evocative relics of a bygone era. Visitors can explore the well-preserved ghost towns, marvel at the rusting machinery, and wander through the remnants of workers' homes, schools, and theaters, gaining insight into the challenging lives of those who once lived and worked there. The site provides a unique opportunity to delve into the history of nitrate extraction and its impact on Chile's economy and society.