Castellar de n'Hug is a town located at 1,450 meters above sea level, within the Cadí-Moixeró natural park, on the south side of the Pyrenees. It appears for the first time documented in the year 839, in the act of consecration of the cathedral of Urgell. Most likely the first building was the parish church of Santa Maria, replaced in the 11th century by the Romanesque church that has been partially preserved to this day. The castle that gave rise to the place name has already disappeared, although some remains can be seen.
The town has traditionally lived off livestock farming, and also on smuggling, especially in times of war and post-war. The area has always been a transit area for refugees and fugitives. At the beginning of the 20th century, with the opening of the Portland cement factory, one of the best examples of industrial architecture in Catalonia, its economic activity was revitalized.
Currently, and thanks to the fact that the popular architecture of the area has been preserved, based on the use of stone, wood and tiles, the municipality is a tourist attraction, and has been declared by the Ministry of Tourism as one of the most beautiful towns in Spain.