This 13th-century castle is located in a strategic position overlooking the city. It has a long, narrow shape with a polygonal floor plan and is divided into three areas, one of which contains the rectangular Alfonsí Tower, with three sections covered by Gothic vaulted ceilings. This tower was rebuilt in the 15th century. Also outstanding is the Espolón Tower with Mudejar influences. The castle has been restored as a themed area dedicated to visitors and to the interpretation of heritage, under the name of the Fortress of the Sun. This initiative has earned Lorca a place on the shortlist of the European Commission's EDEN programme (European Destinations of Excellence), in recognition of its sustainable tourism proposal.