[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]

[gleeaikin]

I ran across this article, and thought it might interest you. I couldn’t get the video to play, but there might be more about this moon cave at another site.

https://www.aol.com/video/view/huge-cave-discovered-on-the-moon/59e8ba0f83b51f7cee168d81/

[SunkenCiv]