A snowy scene greets visitors around the Toklat River, on Monday, Aug. 31, 2015, in Denali National Park and Preserve, Alaska. The summer travel season is winding down at Denali National Park and Preserve, a time of year that sees the vast majority of visitors to this largely wild place. The park is an adventurers paradise with few marked trails inviting backcountry exploration. (AP Photo/Becky Bohrer)