BBCnews linked up this report on the discovery of an ancient Chinese observatory. Thought to be about 4100 years old, it "consists of a semicircular platform 40 metres (130 feet) in diameter, surrounded by 13 pillars which were are believed to have been used to mark the movement of the sun through the seasons."

Fans of Stonehenge should find all of this familiar. Convergence doesn't just happen in biological evolution ya know.