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Ron Dungan – Oct. 8, 2012 05:16 PM | The Arizona Republic Matthias Kawski walked the Canyon’s edge, staring into the void. He scanned the hillsides and drop-offs and retraced his [...]

The Last of the Great Unknown is the story of slot canyons of the Grand Canyon, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls. The [...]