Lorca's Castle. Fortress of the Sun.

Castle of Lorca is a fortress of medieval origin constructed between the 9th and 15th centuries. It was declared listed building by decree of the Spanish Ministry of Public Instructions and Fine Arts of June 3, 1931, rises crowning the city on a hill with optimal conditions of security and control over the Guadalentin Valley, encouraging the population establishment since prehistoric times.
It is located at Lorca (region of Murcia), at 70km from city of Murcia.
For more information, here, tourist information. Or, wikipedia.