Technique reveals engravings more than 2 metres tall in an underground cavern in Alabama.
Scans of an Alabama cave wall revealed an engraved human figure nearly one metre tall. Credit: Photo by S. Alvarez; illustration by J. Simek
Some of the largest-known Native American cave art has been revealed with the help of 3D imaging, which uncovered figures spanning more than 2 metres in an Alabama cavern
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