Peña de Martos Castle is located in the foothills of Las Cordilleras Béticas, in La Peña hillsides. A great panoramic view of the Guadalquivir valley can be seen from its location.
During the Middle Ages, Martos had one of the most impressive fortresses in Andalucía. It was formed by two castles. One built in La Peña from which its name was taken, and De la Villa Castle built in the very center of the town. La Peña castle remains belong to the fortress that los calatravos (Order of Calatrava) built in 1340.
It has a trapezoidal floor adapted to the meseta surface on which it lays. Its entrance, for security reasons, has a zig-zag design. The enclosure is divided into the Alcázar or castle and the parade ground is protected by a fortified enclosure. The Alcázar, where the keep is raised, is built over a natural pedestal 3m above the parade ground, separated by a natural moat. On the northeast side, the lower part of the castle, there is a reservoir that collects water from the rain that falls over a raised, rectangular area built of stone.
Builders took great advantage of the La Peña meseta surface by building walls where the land sloped most steeply. These walls were built as retaining walls with the parapet at the same level as the parade ground.
The area of Martos has been inhabited since remote times. In the 5th century, the Iberians built the oppidum de Tucci. During the years 17 and 14 B.C, being Emperor Augustus, the Romans founded the colony Augusta Gemella Tuccitana, part of the Bética province. Later on, Muslims built the first fortress that strengthens the enclosure.
From 1228, Martos became the center of La Encomienda of the Order of Calatrava in Jaén Reign. Calatravos strengthened La Peña defensive system and built the Keep. They also built the chapel, reservoir, oven, mill and winery.
The fortress was attacked continuously by Muslims until the conquest of Granada. Once the fortress had no military interest, its decline started.
During the 16th century, La Peña castle was abandoned.
The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.