Professional puzzle inventor (apparently, there is such a thing) Bruce Bedlam has created a scale model of what he thought Stonehenge should look like: a round building revolving around the number 3:
He believes that the Wiltshire monument was created with a large, domed roof made from wood and covered in wooden tiles.
Bruce believes the siting was significant and the sun would enter the interior at every solstace through one of the ten doors.
The enormous interior would have been illuminated at various times of the day and every part of the building was correlated around the number three.
The theory suggests that beams were used to create a roof that came to a point above the monument.
They were held together in place by gravity and the shape would have been accousticaly perfect, according to Bruce.