Alhambra, Granada, Spain

The palace complex of the Alhambra is one of the most refined examples of Islamic art anywhere in the world and an enduring symbol of 800 years of Moorish rule of Al-Andalus. From afar, the Alhambra's red fortress towers dominate the Granada skyline, set against a backdrop of the Sierra Nevada's snow-capped peaks. Up close, the Alhambra's perfectly proportioned Generalife gardens complement the exquisite detail of the Palacio Nazaríes. Put simply, this is Spain's most beautiful monument.