Castell de Guàrdia was a ridge-top fortification above Guàrdia de Noguera in Castell de Mur, Pallars Jussà, originating the town and its ancient municipal term. Part of an 11th-century defensive network alongside Castell de Mur and Castell de Llordà, it was first documented in 958 when Count Ramon III of Pallars granted it as a fief to Berenguer. Elevated at 717 meters, the structure comprises an enclosure with rounded corners and a distinctive triangular tower approximately 8 meters high, with adjoining walls extending about 24 meters. The site is accompanied by the old Romanesque Church of Sant Feliu that served as the castle's chapel, and a marked trail leads visitors from the village entrance up the clifftop to explore this important medieval military installation.
