What is it? Where is it?

[MyManao]

Stonehenge 4000 years ago.

Actually, I figured if anyone knew this one it would be you. I imagine it has something to do with space. Btw, google image lookup thinks this new imagine is somewhere in Egypt. But no matter, it obviously is a hard one. Here's a more expanded view. Maybe a bit more of the terrain will help.



I especially like the radiating arms at the for points of the compass. 

As to more clues.. it's in the Hamakua district. But that alone is more a diversion than one might imagine. And, omg I can't wait for someone to tell us what it is. I mean where is fine. It's somewhere and findable.. my originals are from google satellite view.. but what is it? And why?