The Alhambra is a palace and fortress complex located in Granada, Andalusia, Spain. It was originally constructed as a small fortress in 889 CE on the remains of ancient Roman fortifications, and then largely ignored until its ruins were renovated and rebuilt in the mid-13th century by the Arab Nasrid emir Mohammed ben Al-Ahmar of the Emirate of Granada, who built its current palace and walls. It was converted into a royal palace in 1333 by Yusuf I, Sultan of Granada.
After the conclusion of the Christian Reconquista in 1492, the site became the Royal Court of Ferdinand and Isabella (where Christopher Columbus received royal endorsement for his expedition), and the palaces were partially altered in the Renaissance style.
Alhambra is now one of Spain's major tourist attractions, exhibiting the country's most significant and well-known Islamic architecture, together with 16th-century and later Christian building and garden interventions. The Alhambra is a UNESCO World Heritage Site.