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Top 10 Underground Adventures

Top 10 Underground Adventures 1 of 12 Photo by Flickr: ckmck

Top 10 Underground Adventures

Top 10 Underground Adventures

We've scoured the Earth for tunnels, caves, buried neighbourhoods, and other treasures hidden beneath mountains, prisons, and even thriving cities. Take a look at the wonders that hide beneath the surface...

Flickr: ckmck

Oct 19, 2012