Stonehenge, Avebury and Associated Sites are UNESCO World Heritage Sites located in Salisbury Plain in Wiltshire, England. Salisbury Plain is about 130km south-west from London, England. The origin of Stonehenge has been a curiosity of many people for a long time. But recently this mystery was revealed by a geologist from University of Leicester. He argues that the Stonehenge stones came from a quarry that is separated about 160 miles from Wiltshire and is located in the north of Pembrokeshire. But this theory is limited to bluestones that weigh 4 tons.

Stonehenge is one of the most famous sites in the world and is composed of a circular setting of large standing stones set within earthworks. Some rocks at Stonehenge are diabase and rhyolite. Stonehenge that consists of two materials of stone is divided into some parts. One type of stone is called sarsen which makes up the outside circle and Trilithon. The other is called bluestone which is consists of the small inside circle and horseshoe shaped stone. Almost every stone is 7m in height and 45 tons in weight. And the bluestone is 4 tons in weight. At first in the case of the shale circle, 30 stones of shale are stood upright and form a circle by lying the stone horizontally in a line. Now there are only 17 shale stones remaining. In the other case of stones such as the bluestone, a circle is made of many kinds of stones that have small and irregular shapes. They are lying in a straight line related to sunlight. For this reason many people insist this place was a sundial or an astrophysical observatory.

That argument is the most powerful opinion and was developed in the 19^th century. But there are still many suppositions by scholars such as it was some kind of seat of the gods or a cattle pen. There is always evidence supporting different theories but usually it is not hard evidence. So there has been a lot of speculation on how ancient people used it. It remains a mystery.

Another curiosity is how they moved such heavy stone. A prevailing theory is the use of sleds made by huge logs. This is the most persuasive argument to many people. Cutting the huge stone roughly and loading it on the sled and then pulling it to the destination is problematic though. Scholars say it would take over generation and needed 1000 people to move the stones. And some geomorphologists insist the stones were moved by movement of glaciers. But the research team discounts this theory of Stonehenge. They maintain ancient people quarried stones and it refutes the theory of moving stones by the movement of glaciers. This argument is the first disclosed fact.

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