Cueva de los Covachos Nature · Almadén de la Plata, Sierra Norte, Seville Image of Almadén de la Plata, not of the place itself. 593-metre-long cave documented between 1997 and 2000, with 181 rock engravings from the Neolithic and Bronze Age. Photo: Pjmmacarro (CC0) What to see and do in Almadén de la Plata