Walking up Yosemite's famous Four Mile Trail

Schoolteacher Dave D'Antonio, 55, of Castro Valley, California, takes you up the Four Mile Trail from Yosemite Valley to Glacier Point on July 11, 2016.
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Schoolteacher Dave D'Antonio, 55, of Castro Valley, California, takes you up the Four Mile Trail from Yosemite Valley to Glacier Point on July 11, 2016.