Above: Close up view of a section of Stonehenge (image © David Fowler)
35 tonnes – the weight of the largest sarsen stones (the uprights of the Great Trilithon).
20 tonnes – the average weight of the sarsen circle uprights.
3 tonnes – the weight of the largest bluestones.
40 tonnes – the estimated weight of the heel stone.
12 – the estimated minimum number of days it would have taken to drag a sarsen from the Marlborough Downs.
200 – the estimated number of people it would take to drag a sarsen stone on a simple wooden sled.