Surrounded by the sea and with magnificent views, this route boasts places that date back to prehistoric times, and 16th-century military bunkers. But there’s no doubt that the true majesty of this mountain is its summit, where a breathtaking panorama of sea and mountain opens up before you, stretching all the way from the Basque coast to the Cantabrian, and interspersed by the myriad of inland villages of Greater Bilbao.