FILE - This Sept. 16, 2015, file photo, shows Zion National Park, near Springdale, Utah. Visits to U.S. national parks set a record in 2016 for the third consecutive year as landmarks such Zion, Yellowstone and Rocky Mountain experienced historic levels of popularity that brought collateral headaches stemming from overcrowded roads and trails and increasing visitor misbehavior. (AP Photo/Rick Bowmer, File)
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