Article in the Boston Globe about visiting the Senegambia Circles, with a photo.
Sénégambian stone circles come in several forms. The most common consists of a dozen or so monolithic, laterite pillars, arranged in a circle around a grave, with one "frontal stone" on the eastern side. These circles, along with smaller stone ones and simple stone-covered mounds, or tumuli, were secondary burial sites. Bones were placed here after the rest of the body decomposed at a primary site. The bones, usually from several bodies, were arranged according to an elaborate plan that no one today understands.
The circles were also grouped in precise arrangements that are equally mysterious. And it was all done by a people that no historian or anthropologist has been able to identify, even though the circles were made continuously for about 2,800 years starting in 1300 BC. The circles are so absent from any conventional history, in fact, that although there are about 17,000 stone circles in 2,000 groupings across the region, most of my Sénégalese friends had never heard of them.
http://www.boston.com/travel/getaways/africa/articles/2008/09/28/in_africa_stone_circles_speak_across_the_ages/?page=1
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