This is the Great Mosque in Djenné, Mali. It is the largest mud brick (adobe) building in the world. Djenné is a small adobe built town on the floodplain between the Niger and Bani rivers. During the rainy season, the two rivers overflow turning the town into an island that is accessed by causeways. The Mosque it is built on a raised platform of mud bricks protecting it from the most severe floods.


http://naturalhomes.org/great-mosque-djenne.htm?a=groups