Yacimiento de Kurtzio Historical milestone · Sopela, Plentzia-Mungia, Bizkaia Settlement with a presence in Sopela since Prehistory; near the Atxabiribil cliff, fragments of Roman pottery have been found, including terra sigillata possibly from the 3rd century. Photo: Alfa.Alfa (CC BY-SA 3.0) What to see and do in Sopela