Built in 1769 atop a rocky Mediterranean promontory near El Ejido, Guardias Viejas Castle served as a coastal defensive battery against pirates and corsairs. This 18th-century fortress, constructed during the reign of Charles III, features a quadrangular design with a courtyard providing access to multiple chambers, including barracks, stables, a powder magazine, and a chapel. After suffering partial destruction during the Peninsular War, the castle was rebuilt in 1817 and declared a Cultural Heritage site in 1985. Today it houses military exhibitions and hosts summer concerts. The site welcomes visitors Tuesday through Friday 15:00–18:00 and Saturday–Sunday 10:00–18:00, closed Mondays.