This blog (by Zeev Barkan) is dedicated to the Star of David, its history, its various meanings and usages in different cultures. It includes thousands of pictures of Star of David, six-pointed stars, hexagrams, Solomon's Seals, Magen Davids and yellow badges,and served as a resource for three books and four art exhibitions.
John Michell, in his book New Light on the Mystery of Glastonbury, 1990 describes a hexagram inside a square in the ground plan of the prehistoric monument of Stonehenge, England, third millennium BCE.