Between a rock and a high place: Facing down a 300-foot drop in Colorado’s Rocky Mountains

The path ahead, etched into a shadowy gray massif high in the Rocky Mountains, is narrowing — two feet wide, one foot, six inches and then . . . nothing. Your next step could take you into a column of air extending infinitely upward and, somewhat more concerning, more than 300 feet straight down. This is a couple of miles east of Telluride, Colo., halfway through a 1½...

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