Almost 400 mysterious stone structures dating back thousands of years have been discovered in Saudi Arabia, with a few of these wall-like formations draping across old lava domes, archaeologists report.
Many of the stone walls, which archaeologists call "gates" because they resemble field gates from above, were found in clusters in a region in west-central Saudi Arabia called Harrat Khaybar.
The archaeologists involved in the research aren't sure of the purpose, or even the exact age, of these gates. [See Images of the Mysterious Stone Structures in Saudi Arabia]
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