archaeological site of atapuerca, burgos, spain

age ancient antecessor antique archaeological arqueologic arqueological artifacts atapuerca biface bones bronze burgos castile castilla cave cranium dolina europe evolution excalibur excavation fossil gran heidelbergensis heritage historical history holidays hominid hominins homo huesos human karstic leon león miguelon mountains neolithic old paleontology pleistocene prehistoric primitive sima site skeleton skull spain stone study travel trip unesco world