Stone Age man created a massive network of underground tunnels criss-crossing Europe from Scotland to Turkey, a new book on the ancient superhighways has claimed.
German archaeologist Dr Heinrich Kusch said evidence of the tunnels has been found under hundreds of Neolithic settlements all over the continent.
In his book – Secrets Of The Underground Door To An Ancient World – he claims the fact that so many have survived after 12,000 years shows that the original tunnel network must have been enormous.
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