I love obscure things like this. Michael Cook is a writer, photographer and 'urban explorer'. Based in Toronto, he journeys into the subterranean civic infrastructure of Canada and posts maps and photographic work on his website 'The Vanishing Point'.
"Despite the visions of futurists, the work of our planners and cement-layers thankfully remains a fractured and discontinuous whole, an urban field riven with internal margins, pockmarked by decay, underlaid with secret waterways. Stepping outside our prearranged traffic patterns and established destinations…we find a thousand vanishing points, each unique, each alive, each pregnant with riches and wonders and time."
For a UK perspective on subterranean urban exploration check out 'Sub-Urban':"a collection of stories, facts, photographs and video from two friends who choose to venture where our curiosity so leads us".
Who'd have thought sewers and drains could be so beautiful?