An interesting documentary on Ancient Tunnels. tags: ancient man made tunnels, ancient man made tunnels - underground civilizations ( documentary), man .<br />Documentary - ANCIENT MAN MADE TUNNELS - Underground Civilizations. Documentary - ANCIENT MAN MADE TUNNELS - Underground Civilizations.<br />Who could have constructed the ancient underground city in Derinkuyu, Turkey, a complex labyrinth of caves large enough to shelter 20000 people?<br />Video Credit goes to the account of Oracle Tracker. Why are we NOT told in school systems about the THOUSANDS of miles of ancient stone walls all over the .
