Castelo de Monterrei is a 15th-century fortress perched on a hilltop in Ourense, Galicia, positioned at a strategic frontier point between the historic kingdoms of Galicia and Portugal. The castle comprises three walled enclosures featuring the Renaissance-style Palacio de los Condes and impressive towers including the Keep and Las Damas, showcasing centuries of military and residential architecture. Originally serving diverse purposes from medieval stronghold to pilgrimage hospital, the castle underwent comprehensive rehabilitation and now operates as a Parador de Turismo de España, seamlessly blending historic character with contemporary hospitality overlooking the town of Verín.