Headlamps illuminate the trail as hikers head down from the summit of Piestewa Peak in the heart of Phoenix on July 28, 2015. The steep, rocky trail ascends 1,500 feet above the city, making it a popular attraction even when temperatures rise well into the hundreds during the summer. As the sun goes down the peak becomes a sanctuary for hikers who prefer to avoid hiking in the heat of the day. (For The New York Times)
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