chocolatesmoothie posted this is the beautiful african pictures topic and i thought it would go better under history so i moved the picture over here and added the history.  thanks chocolate for posting, i just think it got into the wrong topic.

The Mosque of Djenne, Mali

Djenné, the oldest known city in sub-Saharan Africa is situated on the floodlands of the Niger and Bani rivers, 354 kilometers (220 miles) southwest of Timbuktu. Founded by merchants around 800 AD (near the site of an older city dating from 250BC), Djenné flourished as a meeting place for traders from the deserts of Sudan and the tropical forests of Guinea. Captured by the Songhai emperor Sonni 'Ali in 1468, it developed into Mali's most important trading center during the 16th century. The city thrived because of its direct connection by river with Timbuktu and from its situation at the head of trade routes leading to gold and salt mines. Between 1591 and 1780, Djenné was controlled by Moroccan kings and during these years its markets further expanded, featuring products from throughout the vast regions of North and Central Africa. In 1861 the city was conquered by the Tukulor emperor al-Hajj 'Umar and was then occupied by the French in 1893. Thereafter, its commercial functions were taken over by the town of Mopti, which is situated at the confluence of the Niger and Bani rivers, 90 kilometers to the northeast. Djenné is now an agricultural trade center, of diminished importance, with several beautiful examples of Muslim architecture, including its Great Mosque.

In addition to its commercial importance, Djenné, was also known as a center of Islamic learning and pilgrimage, attracting students and pilgrims from all over West Africa. Its Great Mosque dominates the large market square of Djenné. Tradition has it that the first mosque was built in 1240 by the sultan Koi Kunboro, who converted to Islam and turned his palace into a mosque. Very little is known about the appearance of the first mosque, but it was considered too sumptuous by Sheikh Amadou, the ruler of Djenné in the early nineteenth century. The Sheikh built a second mosque in the 1830's and allowed the first one to fall into disrepair. The present mosque, begun in 1906 and completed in 1907, was designed by the architect Ismaila Traoré, head of Djenné's guild of masons. At the time, Mali was controlled by the French, who may have offered some financial and political support for the construction of the mosque and a nearby religious school.

The Great Mosque is built on a raised plinth platform of rectangular sun-dried mud bricks that are held together by mud mortar and plastered over with mud. The walls vary in thickness between sixteen and twenty-four inches, depending upon their height. These massive walls are necessary in order to bear the weight of the tall structure and also provide insulation from the sun's heat. During the day, the walls gradually warm up from the outside; at night, they cool down again. The mosque’s prayer hall, with ninety wooden pillars supporting its ceiling, can contain as many as 3000 people. This helps the interior of the mosque to stay cool all day long. The Great Mosque also has roof vents with ceramic caps. These caps, made by the town's women, can be removed at night to ventilate the interior spaces.

Continued:  http://www.sacredsites.com/africa/mali/djenne.html   

Timbuktu: http://www.youtube.com/watch?v=L6GVKbmCnGo&feature=related