Segontia Lanka, the Celtiberian mint Curiosity · Langa de Duero, Tierras del Burgo, Soria Image of Langa de Duero, not of the place itself. The origin of the town goes back to the Celtiberian settlement of Segontia Lanka, which minted its own coin between the second and first centuries BC. Its remains are spread over the hill that commands the flood plain of the Duero. Photo: Draceane (CC BY-SA 4.0) What to see and do in Langa de Duero