#1 Alhambra (Granada)
The Alhambra, a fortress and palace for the Nasrid sultans set on the Sabika hill, is the pinnacle of Hispano-Moorish architecture. The Nasrid Palaces impress with intricate stucco and legendary courtyards like the Patio de los Leones (Court of the Lions). The military Alcazaba and Generalife gardens round out this UNESCO site, which welcomes three million visitors annually.