优胜美地国家公园 (MARK RALSTON/AFP via Getty Images)
People picnic on the exposed sandy bottom of Mirror Lake that is normally underwater and used by visitors to photograph reflections of the Half Dome rock monolith at Yosemite National Park in California on June 4, 2015. At first glance the spectacular beauty of the park with its soaring cliffs and picture-postcard valley floor remains unblemished, still enchanting the millions of tourists who flock the landmark every year.(MARK RALSTON/AFP via Getty Images)
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