Amazing Underground Secrets (2012)

Genres - Culture & Society  |   Sub-Genres - Architecture & Design, World History  |   Run Time - 180 min.  |   Countries - USA  |  
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This multi-part documentary explores the fascinating but seldom-seen world of underground caverns, tunnels, and more. From the tunnels once used by smugglers to evade the forces of the law, to the ancient underground cities created by mysterious peoples, these feats of engineering and wonder puzzle travelers to this day.

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Keywords

cavern, engineering, secrets