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Archaeologists are mystified by ancient “gates” in Saudi lava fields | Ars Technica
Mysteriöse 9000 Jahre alte Geoglyphen in Saudi-Arabien entdeckt, Zweck bislang unbekanntSun Oct 22 11:32:13 2017 - permalink -- https://arstechnica.com/science/2017/10/archaeologists-are-mystified-by-ancient-gates-in-saudi-lava-fields/
