Cave del Valle, Cantabria

Prehistoric cave in the municipality of Rasines, Cantabria, northern Spain, serving as the source of the Rio Silencio. The underground system known as Caballos-Valle spans 60.2 km of passage with 447 m of elevation change, making it the longest cavity in the region and second longest in Spain. In 1905, priest Lorenzo Sierra discovered Azilian harpoons, Upper Magdalenian spear points, and other bone tools documenting human occupation from c. 7000 BC. In 1983, a rock carving depicting a goat head in frontal view was found, attributed to the Upper Final Magdalenian period (c. 12,000 years old). The site now operates as a Paleolithic Park featuring the cave vestibule and a life-size mammoth recreation.