@CNN: Grand Canyon National Park turns 100 tomorrow. Hear the story of an adventure photographer and videographer who decided to hike the length of the canyon to highlight threats to its existence. https://t.co/e3A8vaDsXe https://t.co/7fMqBVdhss

@CNN: Grand Canyon National Park turns 100 tomorrow. Hear the story of an adventure photographer and videographer who decided to hike the length of the canyon to highlight threats to its existence. https://t.co/e3A8vaDsXe https://t.co/7fMqBVdhss