[TXnMA]

I've found and placemarked additional "wheel" structures -- including concentric "wheels within wheels" -- but no linear structures like the ones in the article.

However, I've also found lots of apparent modern "aimless dirt moving" -- including a 3.5 mile long curving "dirt ridge", with regularly-spaced spoil dirt dump piles aligned on top of it. Only thing I can think of is an attempt at an earthen-fill dam -- in a place with no water...

If any of you do manage to locate some of these "gates", please ping me -- and include the Google Earth coordinates. Thanks!

[SunkenCiv]

Thanks BenLurkin and TXnMA. There are apparently prehistoric sites of this kind stretching from Syria to Yemen, and megalithic sites are also found across the gap, in Africa (see the search link above).

• Stone Circles In Saudi Arabia [8/25/2004]
• Visible Only From Above, Mystifying 'Nazca Lines' Discovered in Mideast [9/14/2011]
• Mideast riddle: Strange stone structures caught on camera [9/17/2011]
• Enigmatic standing stele of Al-Rajajil [12/20/2011]

  [snip] Al-Jouf province, Sakkaka, Saudi Arabia [/snip]

  and, a fascinating sidebar:
• 'Discovery of a lifetime': Stone Age temple found in Orkney is 800 years older than Stonehenge... [1/04/2012]