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Old Towns of Djenné, Mali: build on a island (the date is unsure but it was apparently built in the 15th century), Djenné was a leading point of the trans-Saharan trade where gold, salt and goods would be exchanged. The renowned Great Mosque of Djené, built in 1907 is the largest monument in the world made of raw earth. The city is inhabited by nomadic and sedentary ethnic groups. Djenné’s history is linked to Timbuktu, as they traded and both were center of  Islamic scholarship and teaching. The towns are recognizable for their Sudano-Sahelian architectural style using mudbrick. Djenné was added by UNESCO in 1988 because it bears an exceptional testimony to a cultural tradition and civilization.****