The shortest distance between 47 points—celebrating the centennial of the National Park Service by c
A researcher at the University of Pennsylvania decided to make it easier to celebrate the centennial of the National Park Service by proposing a travel route that is being billed as the shortest distance between all 47 national parks in the continental United States.
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How to visit nearly every national park in one epic road trip
By Christopher Ingraham
The Washington Post
August 2, 2016