Is it manmade or similar to the Bosnian pyramid? Probably the latter.
"But such signs on hill-slopes have not been reported from Peru," says Dr Karanth.
Got me started looking for a photo of the immense large cross/tree - like marking that is visible (from the sea) on a south American hillside. I haven't found it yet, but, my search turned up this source of beautiful IKONOS satellite views of major ancient sites:
http://www.world-mysteries.com/mpl_satellite.htm
If you haven't seen it yet, it is definitely worth a visit...
I'm not terribly impressed. Astronomy is critical for any primitive agricultural society. It is life and death to know when to plant. But there are limited means you can use for your observations, so no surprise when similar conclusions are reached.
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I suspect that sculpted land forms were much more common than they are today. The major known sets are in a South American desert and the Ohio River Valley. These may have had any number of mundane or religious uses, ie. road signs, ceremonial places. In intensively used landscapes, these would likely be plowed under and destroyed within a eneration of their prvious use ending.