Alhambra is an ancient Arab fortress located near Granada, Spain. It is considered the most famous example of Islamic influence in Spain. Construction began in 1238 for defensive purposes. The fortress has architectural and decorative characteristics typical of Islamic mosques, including an emphasis on light, geometric patterns, and alternating stuccos, tiles, and arabesques. Today it is a UNESCO World Heritage Site and a popular tourist destination that reflects the cultural exchange between Christian and Islamic civilizations in medieval Spain.