7 Underground Wonders of the World [PICS]

Source: Digg
Posted: 2007-10-01 18:48:13

What motivates humankind to burrow deep into the Earth? From London to Paris, Budapest to Moscow, the USA to Australia, the world is filled with strange underground wonders, some centuries old or older. Check out these amazing images of tunnels, caverns, labyrinths from major cities around the world. Some of them might be right under your feet