The cairns of Lake Constance | Tomorrow Today - The Science Magazine | DW | 06.03.2020
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Tomorrow Today

The cairns of Lake Constance

170 cairns lay undiscovered beneath the surface of Lake Constance for thousands of years - in a perfect 10km line. Measurements show they were built by humans. Now scientists are trying to find out: How old are they? And why were they built?

Watch video 08:17