1875 Carlist surrender Historical milestone · la Seu d'Urgell, Alt Urgell, Lleida Image of la Seu d'Urgell, not of the place itself. The city and the fortress that dominates it were a key piece of the Pyrenees during the Carlist wars of the nineteenth century. The stronghold held out until its surrender in 1875, at the end of the Third Carlist War, closing more than forty years of intermittent conflict. 1875 Photo: Concepcion AMAT ORTA… (CC BY 3.0) What to see and do in la Seu d'Urgell