The Alcazaba, the defensive fortress of the Alhambra Palace, Granada, Andalusia, Southern Spain, built under Mohammed I in the 13th century. The Alhambra was begun in the 11th century as a castle, and in the 13th and 14th centuries served as the royal palace of the Nasrid sultans. The huge complex contains the Alcazaba, Nasrid palaces, gardens and Generalife. Picture by Manuel Cohen
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