JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Trinchera del Ferrocarril, Spain. This trench was dug in the foothills of Sierra de Atapuerca at the end of the 19th century. The site was intended for a mining railroad but the railway company went bankrupt. However, the construction of the railroad exposed a variety of archaeological sites, including Gran Dolina (scaffolded area). The sites have been studied on and off over the past century, leading to a massive advancement in the understanding of human evolution. It is thought that the site will continue to produce evidence of our past well into the future. In 2000, Sierra de Atapuerca was made a world heritage site by UNESCO.
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