Castillo de La Peña - Martos
This high fortress is the ruins of a fourteenth-century castle built by the Order of Calatrava, which was itself built over the ruins of another ancient Arab fortress; this, in turn, was constructed over another primitive Iberian-Roman fortification. It was one of the main defensive bastions that the Order of Calatrava had in front of the Nasrid Kingdom. Legend has it that the crime against the Carvajales Brothers took place in and around it, carried out by King Ferdinand IV of Castile, which cost the Monarch his life. Declared a National Historical Monument in 1985.