Great Smoky Mountains 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 canyons and Narrows of Zion National Park to the beautiful coastline of Acadia National Park, we now turn to the most visited park in the USA: Great Smoky Mountains National Park.  Take a virtual trip through the park in video and photos, then read up on tips for visiting.