September 13, 2016
Former Grand Canyon ranger Amy Martin watches a winter sunrise over a section of the Colorado called Conquistador Aisle in this image from the September issue of National Geographic magazine. © Pete McBride/National Geographic Magazine
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In mid-October, author Kevin Fedarko and National Geographic photographer Pete McBride will finish the final leg of a nearly 670 mile hike through the heart of Grand Canyon where they have taken an in-depth look at what they consider to be a growing number of threats surrounding the canyon.