David Allgood uses a trail adapted for persons with disabilities to view a scenic overlook of the Green River at Mammoth Cave National Park in Cave City, Ky., Friday, June 22, 2018. National Park Service accessibility chief Jeremy Buzzell says nine parks across the U.S. have received more than $10 million in federal funding to design and build accessibility projects as examples for other parks. (AP Photo/Bryan Woolston)
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