Castle of Tost Monument · Ribera d'Urgellet, Alt Urgell, Lleida Remains of a fortress already documented in the year 815 -9th century-, in a sale document of the monastery of Sant Climent de Codinet which cites it as 'castro que dicitur Tauste', in the deserted settlement of Tost, on a rocky spur of the valley of the same name, at 789 m above sea level. At the beginning of the 11th century it belonged to Miró, father of the knight Arnau Mir de Tost, who led the Christian troops in the conquest of the vall d'Àger; in 1040 the neighbouring church of Sant Martí was consecrated at the request of Miró de Tost. Its remains are today integrated into what was the village's rectory house, which makes it difficult to identify the parts of the castle. Remains of a staircase leading to the upper part of the south rock and a trapezoidal cistern of 50 m³ survive. Bien Cultural de Interés Nacional (Catalonia's highest level of heritage protection). Photo: Deosringas (CC BY-SA 3.0) What to see and do in Ribera d'Urgellet