Zitouna © Marcus
The largest mosque in Tunisia, the Zitouna Mosque dates back to the 8th century; the 160 columns of the mosque were brought from the ruins of Carthage. Set in the heart of Tunis, the mosque was improved upon almost continually until the 19th century, when the minaret was added. Zitouna (or Al-Zaytuna) was the centre of learning and intellectual pursuits in Tunisia, and is considered the first Islamic university. Visitors to the Zitouna Mosque must dress modestly, and non-Muslim guests may only enter the courtyard. The mosque is surrounded by bustling souks on three sides.