The Great Mosque of Kairouan, a UNESCO World Heritage site, is generally accessible to visitors, though non-Muslims typically cannot enter the main prayer hall. Modest dress (covered shoulders and knees for all, headscarf for women) and shoe removal are required. While solo visits are possible, a local guide can enrich the experience with historical context. The mosque is open year-round, but it's best to avoid peak prayer times and consider cooler hours during the hot Tunisian summer; Ramadan may also affect timings. An approximate entrance fee of 10-12 TND (around $3-4 USD) is usually charged, and a typical visit lasts 1-2 hours to explore its impressive courtyard, architecture, and minaret views. Visitors should maintain respectful behavior, and photography is generally permitted in the courtyard.