World's Most Fascinating Tunnel Networks...
Perhaps of all hidden architectures, nothing amaze... ...urrow deeply. Others, like the booby-trapped Viet Cong Cu Chi Network, have only death and misadventure for tho... ..., from components of the Maginot line to the Viet Cong *s...
https://www.neatorama.com/2009/06/08/worlds-most-fascinating-tunnel-networks/
