The Great Mosque of Djenné, located in the town of Djenné, Mali, is the largest mud-brick building in the world. Constructed primarily from sun-dried mud bricks coated in clay, the mosque stands as an iconic representation of West African Islamic culture. Recognized as a UNESCO World Heritage Site since 1988, it plays a pivotal role not just as a place of worship but also as a testament to the region's rich history and architectural tradition. Every year, the local community comes together in a festival to repair and re-plaster the mosque's walls, which is both a practical maintenance activity and a symbolic gesture of communal unity and cultural preservation.