From the World Heritage inscription:
Unique artistic creations, the Alhambra and the Generalife of Granada bear exceptional testimony to Muslim Spain of the 16th century. They form an exceptional example of royal Arab residences of the medieval period: neither destroyed nor changed by the alterations of radical restorations, the Alhambra and the Generalife appear to have escaped the vicissitudes of time. Despite the development that followed the Christian conquest, the Albayzín still bears witness to the medieval Moorish settlement, as its urban fabric, architecture and main characteristics (form, materials, colours), were not changed when it was adapted to the Christian way of life, to survive as a remarkable example of a Spanish-Moorish town.
If you were to make a short list of the most important heritage sites in the world, the Alhambra would almost certainly make the cut. It is not only an architectural marvel, but also serves as Spain’s greatest monument to the period of time when the Moors ruled the Iberian Pennisula. The historical and cultural significance of the meeting of the Arab and Christian worlds can still be seen in Spain today in the names of many places, architecture and food.
If you are in Grenada, a visit to the Alhambra should be at the top of your list. Make sure to buy your tickets in advance or arrive very early, as there are a limited number of tickets available every day and they do sell out quickly.
View my complete list of UNESCO World Heritage Sites.