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National Park Week starts Saturday, April 21st — and we’ve just launched our newest mobile app, “National Parks by National Geographic,” to help kickstart the celebration. You’ll get instant — and FREE — access to Nat Geo guides to the 20 most visited parks. The park service is offering free admission to all 397 parks from April 21-29. Share your park photos with Traveler by using our #parkpic tag on Twitter and Instagram.