Visitors to the Cascade-Siskiyou National Monument can enter Buck Rock Tunnel, an 1884 railroad passage that tells the story ...
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Archaeologists discover a mysterious underground tunnel inside a prehistoric enclosure, and it was sealed on purpose
A narrow and strage underground tunnel discovered in Saxony-Anhalt is linking medieval activity with a much older Neolithic site. Hidden inside a prehistoric enclosure, the find is giving ...
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