Prado das Chantas Curiosity · O Valadouro, Mariña Central, Lugo Image of O Valadouro, not of the place itself. An oval enclosure marked out by some 250 driven granite blocks, of disputed date and purpose: a prehistoric cromlech, a ceremonial setting or simply a medieval livestock enclosure have all been proposed. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in O Valadouro