A. Location

B. Theories of Builders

1. Druids

2. Greeks

3. Phoenicians

4. Atlanteans

5. Romans

6. Beaker Fold

7. Vikings

A. Prehistoric astronomical observatory

1. To foretell eclipses of the sun and the moon

2. Rituals or religious ceremonies

3. A temple for sky worship

B. The Druids connection: not scientifically proven

C. Stock enclosures for cattle: Clive Waddington

D. King Arthur's grave

A. Period I: Neolithic Age (c. 3100-2300 B.C.)

1. Enclosure: a circular ditch

2. An Internal bank

3. Northeastern entrance

4. A ring of 56 pits: Aubrey holes

B. Period II (c. 2100-2000 B.C.)

1. An earthwork approach road: the Avenue

2. Bluestones from the Preseli Mountains

3. Dismantled double circle

4. The 35-ton heel stone: proof of early astronomy

C. Period III (c. 2000-1500 B.C.)

1. Circle of 30 sarsens

2. Two concentric circles (the so-called Y and Z holes): abandoned

D. Period IV (c. 1100 B.C.)

1. The Avenue extension

A. William Stukeley's notation in 1740

B. Late 19 th and early 20 th centuries

C. Today

A. Stone structures: Structures in British Isles, Carnac and Northern France

B. Tombs: Neolithic tomb in Dublin: Newgrangs

C. Egyptian pyramids and temples

1. Features

2. Possible link with stonehenge

D. Mayan Civilization

E. American Indians: Medicine Wheel

1. Location

2. Features

3. Another medicine wheel

F. South Pacific Cultures

1. Function

2. Star Compass