HistoryNeolithic (c. 9600–8000 BCE site; study published 2019)Southeastern Turkey (Göbekli Tepe)low confidence

A computer algorithm based on standard-deviation mapping found that three of Göbekli Tepe's circular enclosures appear to form a geometric triangle.

Notes on verification

Confirmed by peer-reviewed Cambridge Archaeological Journal study by Haklay and Gopher, plus multiple independent press and science-news outlets quoting the researchers and describing the equilateral triangle formed by enclosures B, C, and D.

Sources