So is Gettysburg National Military Park . April 19-20 is CNN in the California All parks are free to enter Saturday and Sunday , April 19-27 . Kupper and concession fees still apply . What 's the best national park in the world ? Share your photos .
April 19-20 is CNN in the California All parks are free to enter Saturday and Sunday , April 19-27 . Kupper and concession fees still apply . What 's the best national park in the world ? Share your photos .