Stonehenge - Popular Mysteries Megalithic Tombstone

Many popular experts possibility suggest that, mysterious sites around the world were created with help of advanced knowledge & technology (possibly more advanced than our current one) possessed by lost civilizations. Others don’t believe that, there ever was very advanced civilization on earth & all of the excellent knowledge was handed down to us by ancient astronauts who came down from heaven. The majority scientists do not subscribe to any of these ideas and try to explain ancient enigmas on the ground of religion and ritual. 

There have no any individual who has never heard about Stonehenge. I guess it’s one of the most popular mysteries. Stonehenge is a megalithic tombstone on the Salisbury Plain in Southern England, composed mostly of 30 upright stones (each over ten feet tall and weighing up to 45 tons), allied in a circle, with 30 lintels (6 tons each) perched horizontally atop the sarsens in a constant circle.
There is also a central circle composed of similar stones, also constructed in post & lintel fashion. We can say that there are a lot of great monuments all over the world; many of them are very interesting.  

Some have told that Stonehenge was built by Druids, but we do not really know much more about the builders. The archaeology points to a structure date between 5,000 & 3,000 years ago, so it was built even before the first metal tools were used by humankind. Regardless of who built the Stonehenge stone monument , the design & construction must be involved thousands of people. To pull huge stones from Marlborough Downs, thirty kilometers to the south of Stonehenge, would have been pretty a feat. And how was it possible to erect those stones. It’s an amazing feat of engineering & there are many legends that reflect the inability to explain how the heavy stones could have ever been transported by ancient humans. Stonehenge is even mentioned within Arthurian legend, which names Merlin as the engineer.   

One more interesting thing is that, the Stonehenge is angled such that on the equinoxes & the solstices, the sun is rising over the horizon appears to be perfectly placed between gaps in the megaliths. This is no doubt not an accident & probably contributed to the stories of its mysterious origins.