As an urban historian & photographer, I try to peel back the layers of a city to see what's underneath. From the tops of bridges to the depths of sewer tunnels, these explorations of the urban environment help me puzzle together the interconnected, multi-dimensional history and complexity of the great metropolises of the world.(Steve Duncan) In December Steve Duncan took a trip into New York's underground, spending there a whole week, sleeping in the tunnels. Check out some footage of the trip after the jump!...