Zion National Park: A visitor's guide

To celebrate the National Park Service's 100th anniversary this August, USA TODAY will be highlighting one national park per week in a countdown to the centennial on August 25th. From the scenic geological wonders of Arches National Park and the land of giants in central California with Sequoia & Kings Canyon National Parks, we now turn to the canyons and Narrows of Zion National Park. Take a virtual trip through the park in video and photos, then read up on tips for visiting.