Granite blocks are seen in Amapa, Brazil, on May 10, 2006. A grouping of 127 granite blocks along a grassy Amazon hilltop may be the vestiges of South America's oldest astronomical observatory, according to archeologists who say the find challenges long-held assumptions about the region's prehistory. The blocks, some standing as high as 3 meters (9 feet), are spaced at regular intervals around the hill like a crown some 30 meters (100-feet)in diameter, near the village of Calcoene just north of the equator near the coast of Amapa state,which borders with French Guyana in far northern Brazil.
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