The World Heritage declaration Historical milestone · Almadén, Valle de Alcudia, Ciudad Real Image of Almadén, not of the place itself. In 2012 Unesco inscribed the mercury mines of Almadén on the World Heritage list, in a candidacy shared with those of Idrija, in Slovenia. The dossier recognised two millennia of extraction and the preserved mining landscape. 2012 Photo: Raimundo Pastor (CC BY-SA 3.0) What to see and do in Almadén