Erdstall: Europe’s Underground Tunnels
This episode has been translated into English using artificial intelligence (AI). The original script and content come from the Swedish podcast Historiens Mysterier (Mysteries of History).Beneath Europe lie thousands of underground tunnels—narrow, winding, and inexplicably well constructed. Most are dated to the Middle Ages, but some claim they are much older. They have no documented purpose, no ventilation systems, and lack any clear practical function. Instead, everything suggests they may have been used in ritual or symbolic contexts. And yet, no one knows who built them—or why.
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