The Mysterious Cones of the Egyptian Desert

http://io9.com/5147720/the-mysterious-co...ian-desert





A landing strip for alien craft or an ancient monument? The mysterious giant spiral in the Egyptian desert baffling Google Earth users (but don't worry - it's actually an art installation)


http://www.dailymail.co.uk/sciencetech/a...k-art.html

 

:)

 

Not exactly 'ancient' but they sure do make good examples of envirnment and erosion through time!