Humberstone and Santa Laura Saltpeter Works are two former saltpeter refineries located in northern Chile. They were declared a UNESCO World Heritage Site in 2005. The chemical compound potassium nitrate is a naturally occurring mineral source of nitrogen. ... Elabana Falls is in Lamington National Park, part of the Central Eastern Rainforest Reserves World Heritage site in Queensland, Australia. ... 2005 is a common year starting on Saturday of the Gregorian calendar and is the current year. ...

Description from UNESCO World Heritage Site web site:

Humberstone and Santa Laura works contain over 200 former saltpeter works where workers from Chile, Peru and Bolivia lived in company towns and forged a distinctive communal pampinos culture. That culture is manifest in their rich language, creativity, and solidarity, and, above all, in their pioneering struggle for social justice, which had a profound impact on social history. Situated in the remote desert Pampa, one of the driest deserts on earth, thousands of pampinos lived and worked in this hostile environment, for over 60 years, from 1880, to process the largest deposit of saltpeter in the world, producing the fertilizer sodium nitrate that was to transform agricultural lands in North and South America, and in Europe, and produce great wealth for Chile. Because of the vulnerability of the structures and because of the impact of a recent earthquake, the site was also placed on the List of World Heritage in Danger, to help mobilize resources for its conservation.