This is a work of art by the son of the famous UC Berkeley archaeologist Robert F. Heizer. Michael Heizer has done several of these in the Great Basin where his father used to dig. They strongly resemble archaeological excavations for some reason.
I'd imagine about the same number that live in the Sahra.
awesome, I saw this on the discovery channel.
Very Interesting story, thanks.
If I had to guess, Id say it was the original engine, early sixties model?