BY KEVIN FEDARKO
When I worked as a white-water guide at the bottom of the Grand Canyon, I was often struck by how many passengers concluded their odyssey through the most iconic landscape in the United States by invoking the very same epiphany. At the end of each two-week, 277-mile journey down the Colorado River, someone would often come up to me and declare that the canyon was “America’s cathedral — a church without a roof...”