Castle of Montjuïc, Barcelona.

Castle of Berlanga de Duero (Castilla León, Spain)

Castle of Fuentidueña (Segovia, Castilla Leon). Castillo de Fuentidueña (Spain).

Castle Fuentidueña. One of the largest of Castile and Leon.

Castles and walls of Albarracin (Teruel, Aragon)

Albarracín is one of the more beautiful town of Spain, in the province of Teruel, part of the autonomous community of Aragon.
The Albarracin mountains lie to the south and west of the town. In them the Tagus river has its source, and it flows from here through Spain to Portugal.
Albarracín is known for its beauty and attracts many tourists, the castles and the walls.

Castle of Ayub, in Calatayud (Zaragoza, Aragon, Spain)

The castle of Calatayud and the walls of the city are ones of the more important muslim monuments in Spain.

http://www.castillosdearagon.es/?sec=6&fort=191

Tower of The Iglesuela of the Cid (Maestrazgo, Teruel, España)

This tower, built in the thirteenth century tower is a tribute by the former Templar castle. Its windows geminadas and its pointed arches, Gothic style

Castles of Valladolid (Castilla y Leon, Spain). Castillos de Valladolid.

CASTLES OF VALLADOLID: