Edoardo Cignoli : Exploring the World's Tunnels

Tunnels, for many, inspire only claustrophobia and are tough to visit. Still, tunnel fans manage to worm their way in. See some of the world's tunnels and the boring machines workers use to dig through.



via WSJ.com: World News http://online.wsj.com/article/SB10001424127887324165204579029290217772618.html?mod=fox_australian