On August 25, the National Parks Service celebrates its 100th Anniversary, and we celebrate the parks and all that they have provided to photography over the years. From early photographers documenting natural wonders to persuade Congress of the value of a park system, to legendary landscape photographers such as Ansel Adams, to the countless tourist snapshots of Old Faithful, and even to Apple's ubiquitous Half Dome wallpaper, photography and the National Parks have always been intertwined, and our guests understand this as well as anyone. Chris Nicholson is the author of Photographing National Parks, and Kerry Gallivan is the founder of Chimani, an app designed to help users explore and enjoy each National Park. Our discussion touches upon park protocol as it applies to photographers, gear and location tips, the ethics of nature photography, and we celebrate our national achievement and the gift that has been given to generations of photographers. Guests: Chris Nicholson and Kerry Gallivan Photograph: Chris Nicholson