 In collaboration with the Spanish Geological Society ("Sociedad Geológica de España" or SGE), the Institute has drawn up a list of internationally important geosites in Spain.This work, which began in 1999, is part of the Global Geosites project promoted by IUGS in the 1990s and subsequently supported by UNESCO.The origins of the institute go back to the nineteenth century when a commission was established to work on the geological map of Spain.