Avebury Stone Is Found to Rival Stonehenge By Stuart Coles, PA News Archaeologists working at the ancient Avebury stone circle have been surprised to uncover what could be one of the largest standing stones in the country. Experts at English Heritage and the National Trust say the stone could weigh in at 100 tons, rivalling the largest megaliths at its fellow site in Wiltshire, Stonehenge. The surprise discovery was made during work at the 4,500 year-old stone circle to straighten two stones known as the Cove, which have begun to lean over the last 300 years and which it was...