JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Dolmen, Sierra de Atapuerca. This Bronze Age dolmen, or portal tomb, was found in the area surrounding Sierra de Atapuerca, Spain (background). Within Sierra de Atapuerca, there are several archaeological sites that have been studied on and off over the past century, leading to a massive advancement in the understanding of human evolution. In 2000, Sierra de Atapuerca was made a world heritage site by UNESCO.
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