Castillo de la Yedra, also known as the Castle of the Four Corners, stands on Cerro de Salvatierra, the hill upon which Cazorla is built in Jaén province. This defensive enclave was constructed between the 13th and 14th centuries atop a Muslim fortification dating from the 11th or 12th century. The castle comprises three distinct terraced enclosures: an albacara (fortified shelter), a middle enclosure, and an alcazarejo (inner fortress). The alcazarejo, the tallest and most recent structure, is dominated by a large keep that now houses a museum dedicated to the folk art and customs of the Upper Guadalquivir region. The castle remains open Tuesday to Saturday from 10:00 to 13:15 and 16:00 to 19:15, with Sunday hours from 10:00 to 13:15, offering free entrance for EU citizens.