The Great Mosque of Kairouan, located in Kairouan, Tunisia, is an important building in one of the four holy sites of Islam. Built in 670 AD, it is the oldest and largest mosque in North Africa. The stone pillars in the mosque come from different ancient monuments, with a unique architectural style, towering minarets, and arched colonnades surrounding the courtyard, creating a solemn and holy atmosphere. It is a masterpiece of Islamic architectural art.