Great Mosque of Djenne, Mali
The Great Mosque of Djenne is the largest mud-made structure, constructed entirely from wood, sun-baked earthen bricks and mud-made mortar. It was built in 1907 and its still considered as one of the biggest achievements in the Sudano-Sahelian architectural era. In 1988 due to its unique characteristics and importance it was named a UNESCO World Heritage site.
Every year somewhere between April and May before the start of the rain season a local festival is held, when all natives take part in restoring (re-coating) the entire structure damaged by the unforgiving North African sun.