The Castle of Riba de Santiuste (Spanish: Castillo de Riba de Santiuste) is a castle located in Sigüenza, Spain. It was declared Bien de Interés Cultural in 1992. The castle was rebuilt twice: in 15th century for the first time and in 19th century after it had been partially destroyed. 

Castle of Riba de Santiuste

The Castle of Atienza (Spanish: Castillo de Atienza) is a castle located in Atienza, Spain. It was declared Bien de Interés Cultural in 1931. Standing high on a rck, it can be seen from miles around. The castle frequently changed hands between the Muslims (Arabs or Moors) and the European Christians until it was finally taken by Alfonso VI in 1085.
History
The castle is located on the site of earlier Roman and Visigoth fortifications. The Moors first took the castle until it surrendered briefly to Alfonso III of Asturis from 870 to 874 before it was retaken. In 967, it came under the control of Al-Hakam II before being taken once again by the Christians under García Fernández of Castile until the arrival of Almanzor at the end of the 10th century. In the 11th century, it became an important component of the Muslim defences along the River Duero. After being taken by the Christian troops of Alfonso VI in 1085, it was enlarged on several occasions, maintaining its importance.
Under John II, the Navarre troops occupied the castle with 250 horsemen, 500 foot soldiers and artillery. After the castle had lost its strategic importance it became a prison. It was sacked by the French during the War of Independence.
Description
Today the castle consists of a tower and an inner enclosure 130 m by 30 m. The arched entrance is flanked by two square towers. There are two covered cisterns in the enclosure. There is a fireplace on the upper floor of the main tower. Originally the castle had four storeys as well as tunnels which connected it with churches in the town. It was protected by two walls, one connecting the main tower to the entrance, the other protecting the rock itself.

The Castle of Atienza

El castillo de Guijosa o castillo de don Íñigo López de Orozco es una fortificación, emplazada en la localidad española de Guijosa, perteneciente al municipio de Sigüenza (provincia de Guadalajara, comunidad autónoma de Castilla-La Mancha).
Está compuesto de una gran torre central con ventanas, balcones y matacanes; rodeada de un recinto cuadrado rematado de almenas. La puerta de este último está formada de un arco apuntado.​ Un detalle heráldico junto a la puerta parece hacer indicar que fue construido por Íñigo López de Orozco hacia mediados del siglo xv.
Cuenta con la catalogación de bien de interés cultural desde el 25 de junio de 1985

Castillo de Guijosa

The Castle of the Bishops of Sigüenza (Castillo de los Obispos de Sigüenza) is located in Sigüenza in the Province of Guadalajara in central Spain. With foundations dating back to the 5th century, it was extended by the Moors and retaken for the Christians by Bernard of Agen in 1123.
History
The origins of the fortifications in Sigüenza go back to the Celtiberians who inhabited the right bank of the river in the final centuries B.C. The Visigoths built a small castle in the 5th century above the town. The Moors built a large fortified castle or alcazaba in the early 8th century to defend the area against the Christian kings of Leon and Castile. It was enclosed by a defensive wall providing an area known as the medina. In 1124, the castle was retaken by Bernard of Agen allowing Simón Girón de Cisneros to build an episcopal palace there. In 1298, the castle was taken by the troops of Alfonso de la Cerda during the battle against Ferdinand IV of Castile, the boy king, but was defended by the bishop's vassals.[2] In the 15th century, the castle was strengthened by the bishops to protect it from attacks from Aragon and Navarre.
In the late 18th century, Bishop Juan Díaz de la Guerra changed the appearance of the castle from a fortress into an episcopal palace with additional windows, balconies and stables. However, in 1808 during the War of Spanish Independence the castle was taken by the French who seriously damaged it and looted all its riches before it was recaptured by El Empecinado. The episcopal palace was further devastated by fire in the 1830s and had to be abandoned.
Parador
In 1972, the Ministry of Tourism gave the castle the status of a parador or luxury hotel. Restoration of the building began in 1964 and was completed in 1976 by the architect José Luis Picardo. The official inauguration took place in 1978 with the visit of King King Juan Carlos and Queen Sofía. Decorated with banners and suits of armour, the huge lounge is the castle's original dining room.

Castle of the Bishops of Sigüenza

HISTORY AND DESCRIPTION
It’s position dominates not only the valley of Pelegrina, but also the whole meseta that extends even further, where in the Middle Ages there was the important Roman Road ofEmérita Augusta - now the A2 - which even then was a main road. From its heights one could see, or even communicate with, the nearby fortress of La Torresviñán.
The towers at the corners of the wall are solid, and as such don’t have arrow slits, and their only function was to reinforce the walls. The defense, therefore, must have been carried out from the tops of the walls. Its characteristics lead us to date the fortress to the 12th century.
The castle was property of the bishops of Sigüenza, from which king Pedro I snatched it up without a fight in order to maintain his war with Aragón, and later it was sacked by the Navarrese in the 15th century, and reclaimed in turn by the diocesan militia. Above all, it served as a residence and hunting preserve for the archbishops of Sigüenza.
During the War of Succession, in the 18th century, the aristocrats set fire to it. In the War of Independence it was dismantled by Napoleon’s troops so that it wouldn’t serve as a refuge for the guerrillas fighters of Juan Martín the Undaunted.
http://en.www.turismocastillalamancha.es

Castle of Pelegrina

The Castle of Medinaceli is a medieval fortress in Medinaceli (Province of Soria, Castile and León, Spain). It was built in the 9th century and rebuilt in the 15th century. Almanzor died here in 1002.