Unexplained Ancient Stone Structures Found in Arabian Desert

Archaeologists have discovered 400 mysterious stone structures on the edge of volcanoes that could be thousands of years old in a remote desert area in Saudi Arabia.
The stone structures- which were found using Google Earth - have been dubbed the 'gates' because they appear to look like field gates from above.
Built across ancient lava domes, some of these strange features are more than four times the length of a football pitch, and experts believe they may be up to 7,000 years old.
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