Eastoff
But it was a beginning.
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http://www.spiegel.de/international/zeitgeist/0,1518,775348,00.html
A few radiocarbon dating analyses have also been performed, and they indicate that the galleries date back to the 10th to the 13th century. Bits of charcoal recovered from the Erdstall tunnels in Höcherlmühle date back to the period between 950 and 1050 A.D.
Heinrich Kusch, a prehistorian from the Austrian city of Graz, believes that these results are incorrect. He suspects that some of the subterranean systems were built about 5,000 years ago, in the Neolithic period. For several years now, he has been probing Austria's Steiermark region with giant drills for "gateways to the underworld."
