The 5,000 year-old holed stone recently discovered in Sicily. It is thought that the sun would shine through the man-made hole and mark the winter solstice
Image credit Giuseppe La Spina
 
Writing for Live Science,  Rossella Lorenzi reports that –
 
Italian archaeologists have found an intriguing Stonehenge-like “calendar rock” in Sicily. Featuring a 3.2-foot diameter hole, the rock formation marked the beginning of winter some 5,000 years ago.
 
“It appeared clear to me that we were dealing with a deliberate, man-made hole,” archaeologist Giuseppe La Spina told Seeker. “However, we needed the necessary empirical evidence to prove the stone was used as a prehistoric calendar to measure the seasons.”
 
Full article here.