Some stonehenge rocks were at Salisbury Plain 'long before humans'

Some of the largest rocks at Stonehenge were there long before humans and are not likely to have been moved to the location, an archaeologist says.Archaeologists and antiquarians have for centuries wondered why Stonehenge is where it is and why the largest stones were dragged miles to a hillside on Salisbury Plain.It had been thought those stones, called sarsens, were brought from the Marlborough Downs, 20 miles (32km) away.