Enigmatic Ancient Wheel: The 300-Million-Year-Old Wheel and Anomalous Ancient Tracks Across the World
In 2008, a curious find was discovered down a coal mine in the Ukrainian city of Donetsk. As it could not be safely or successfully cut out due to the nature of the sandstone in which it was embedded, the mysterious artifact looking much like an ancient wheel remains in situ down the mine.
Source: ancient-origins.net