Neil
Out of the closet
Archeologists working high in the Peruvian Andes have discovered the oldest known celestial observatory in the Americas — a 4,200-year-old structure marking the summer and winter solstices that is as old as the stone pillars of Stonehenge.
http://www.latimes.com/news/nationworld/world/la-sci-observatory14may14,0,3343915.story