Castell de Fornils, situated at the foot of the Far cliff in Susqueda's La Selva region, is a classic feudal fortress from the 11th-12th centuries with 13th-century additions. Known also as the castle of the Oak, Saint Paul, or the Gleys, it strategically commanded territory between the Far cliff, the Sant Martí Sacalm plain, and the Rupit cliffs. Originally dependent on the Viscounts of Osona, it later passed to the Cardona family and came under the counts of Pallars in the 14th century. The castle featured a circular keep tower approximately six meters in diameter with ground floor, two stories, and roof terrace, complemented by halls, chapel, cistern, and defensive walls ranging from one to twelve meters in height. Recent restoration and consolidation work completed in 2021 has preserved this well-maintained historical monument.