The Great Mosque of Djenné, a UNESCO World Heritage Site, is an iconic example of Sudano-Sahelian architecture, constructed primarily of banco (sun-baked earth bricks). Visiting is best during or shortly after the annual 'Crepissage' festival when the mosque is re-plastered by the community, usually between March and May; seasonal rains can impact accessibility. Given the cultural significance and potential language barriers, a guided tour is highly recommended to fully appreciate the mosque's history and importance; solo exploration is possible but less enriching. Accessibility might be limited for those with mobility issues due to the natural materials and uneven surfaces. The cost is relatively low, primarily covering a small entrance fee and guide services. A typical visit lasts approximately 1-2 hours, but allow extra time to explore the surrounding Djenné market and old town.