Castles are one thing I absolutely loved about living in Spain. We don't really have many old structures in the USA, beyond the Pueblo natives' cliff dwellings. In Spain, as a result of teh reconquest and Moorish conquest, there are many castles to explore and photography.

Nice work with the photo. The composition is very nice, and it lends itself well to monochrome. The circular tower looks interesting. It would be fun to climb up in there and explore :-)