Castell de Sant Pere stands as medieval ruins in Ribes de Freser, nestled in the Catalan Pyrenees of Girona province. Dating from the 11th century, the castle began as a small defensive tower before becoming a documented stronghold under lords like Galceran de Sales in 1140. Though abandoned in the 17th century and later repurposed with a provisional cemetery, archaeological campaigns since 2007 have preserved and consolidated the site. Today, visitors can observe remains of the fortress, including a partially ruined tower, offering insight into medieval defensive architecture and the region's strategic history during Catalonia's feudal period.