Remains of a 10th-century medieval fortress perched on the Roc de l'Àliga, between Nagol and Aixirivall: one of the oldest known castles in Andorra.
Castell de Bragafolls stands on a rocky outcrop, the Roc de l'Àliga, between the hamlets of Nagol and Aixirivall, in the parish of Sant Julià de Lòria. This medieval fortification is believed to have been built around the year 980 on the initiative of Count Borrell II of Urgell-Barcelona, as part of efforts to control the Pyrenean valleys. It is a small defensive structure of roughly 110 m², consisting of a dry-stone enclosure reinforced by a tower and protected by a rock-cut ditch nearly 5 metres deep. Now reduced to ruins, the site bears witness to the defensive organisation of the Andorran valleys in the early Middle Ages, at a time when several local lordships vied for control of the territory. Its elevated position overlooking the valley made it a strategic lookout and defensive post. It is one of the oldest castles whose existence is documented in Andorra.
