El tercer sitio carlista de Portugalete Historical milestone · Portugalete, Bilbo Handia / Gran Bilbao, Bizkaia Image of Portugalete, not of the place itself. During the Third Carlist War, Portugalete endured a ten-month siege between 1873 and 1874. 1873-1874 Photo: JasonParis from Toronto, Canada (CC BY 2.0) What to see and do in Portugalete