Ancient rock formation may be world's oldest observatory
Researchers have calculated a stone formation's age at a historic Australian Aboriginal site, which they claim could prove to be the world's oldest astronomical observatory. The 10,000-year-old structure could also prove to be older than the Stonehenge and Egyptian pyramids. Named 'Wurdi Youang', the arrangement, formed using about 90 blocks of basalt, was reportedly used to track sun's movement.