Paleolithic site of O Chao da Cruz Nature · O Valadouro, Mariña Central, Lugo Image of O Valadouro, not of the place itself. An open-air station where thousands of worked lithic pieces have been collected, together with the neighbouring one at Penas do Carballido; they document human presence in the valley of the Ouro long before megalithism. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in O Valadouro