DOWNLOAD THIS APP! Do your summer vacation plans include a trip to a national park? Then hike over to the iTunes app store and download National Parks by National Geographic. National Geographic's interactive guide to the United States' parks is a handy free app to have whether you're out on the trails or just interested in seeing photos from the comfort of your couch. National Parks by National Geographic is filled with maps, coordinates, points of interest and more to help you get around the parks when you visit. If you do happen to visit the parks, National Geographic has you covered with lots of cool tidbits within the app.