Today, January 21, is Martin Luther King, Jr. Day and in celebration, all 398 US national parks feature free entrance. Although many national parks are free, notable parks waiving their fees include Yosemite, Yellowstone, the Grand Canyon and Olympic National Park. Click here to see other days when the National Parks are free throughout the year, and get out there! The image above is of Grimmell Lake Glacier National Park, Montana.
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