Sima del Elefante
The oldest Sierra de Atapuerca site. 1.3 million year-old human remains have been found here, the oldest in Western Europe.
Galería complex
This site was a natural trap for pre-Neandertal humans 500,000 years ago. They fed on the flesh of animals that fell into this cave.
Gran Dolina
This cave was occupied at two different times in prehistory: Homo antecessors inhabited this cave 850,000 years ago, and then pre-Neanderthals used it as a campsite 350,000 years ago.
Useful links:
Cueva del Mirador complex
Cueva Mayor-Cueva del Silo complex
Open-air sites