Pyramids, Stonehenge and More

[GOE]

Does anyone have any theories on the construction of these ancient structures? Pyramids sort of "appeared" in different areas of the earth during the same time periods. Stonehenge also has similar structures elswhere. What do you think?

[Edward]

Stonehenge has recently been shown to have been designed using simple geometric constructions, too much to detail here but have a look at:

http://sarsen56.wordpress.com/