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About Underground Marvels
Throughout the series, historians, engineers, and experts reveal the sheer scale of these underground structures that seem to defy human imagination. While some underground worlds were designed and built by humans, such as the impenetrable system of underground WWII Nazi bunkers along The Channel Islands, others were created over thousands of years by the harshest of nature's elements, like the legendary caves of Slovenia once believed by locals to be the portal doors of hell. From the subterranean cities along Spain's southern shore, to a spectacular underground maze in Iceland's most volcanic region, UNDERGROUND MARVELS dives into the mysterious creations that lie beneath the surface.
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