Built in 1917 in the Sierra Espuña mountains, this sanatorium was originally a tuberculosis hospital before being converted into a psychiatric facility. It was abandoned in the 1960s, leaving behind a vast, crumbling complex that has since become a hotspot for urban explorers and ghost hunters. Visitors report disembodied voices, shadowy figures in the halls, and a heavy sense of dread lingering in the decayed wards. Its isolation in the mountains has only amplified its reputation as one of Spain’s most haunted ruins.