The Atapuerca Mountains (Sierra de Atapuerca in Spanish) is an ancient karstic region of Spain, near the town of the same name and Ibeas de Juarros, containing several caves, where fossils and stone tools of the earliest known Hominians in West Europe have been found. The sites in this area have been found during the construction of railway cuts (Gran Dolina, Galería, Elefante) and in a cave (Sima de los Huesos). The scientifical excavation, started by Francisco Jordá Cerdá in 1964, has found human remains from a wide range of ages ranging from early humans to the Bronze Age and the modern man. Sites in the area have also yielded stone artefacts. It is excavated by a team led by Emiliano Aguirre from 1978 until 1990 and then jointly by Eudald Carbonell, José María Bermúdez de Castro and Juan Luis Arsuaga. In 2000, the Archaeological Site of Atapuerca was added to the list of World Heritage Sites.