http://www.exploratorium.edu/ancientobs/chichen/HTML/alignments-caracol-win.html
http://www.exploratorium.edu/chaco/HTML/observation.html
The 'Venus' tablet of King Ammizaduga (Room 55, British Museum, London, K160). http://sunearthday.nasa.gov/2012/articles/ttt_73.php
http://wysinger.homestead.com/nabtaplaya.html
http://s4.invisionfree.com/Armenian_History/ar/t3.htm
http://en.wikipedia.org/wiki/Metsamor_site
http://www.mythicalireland.com/
http://www.windows2universe.org/the_universe/uts/stonehenge_astro.html
http://en.wikipedia.org/wiki/Nazca_Lines
http://en.wikipedia.org/wiki/Easter_Island
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