This week's featured UNESCO World Heritage site is located in the Gambia. The Stone Circles of Senegambia are located in four different groups along the River Gambia. Scientists believe they were built over more than a millennium, from 3 BC to the 16th century AD. The origins of these circles remain somewhat mysterious. Archaeologists believe that they were used to mark burial sites, and were possibly built on top of older graves. Other than that, nobody is sure what specific beliefs motivated the people who lived there to build so many stone circles. There is no doubt that the monuments are impressive, however, and just as with Stonehenge, half the fun of visiting them is speculating about who built them and why. According to the UNESCO site, "the survival of so many circles is a un

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