Mysteries at the National Parks

Travel Channel's fascination with mysteries grows with this series, adding it to a catalog that also features "Mysteries at the Castle," "Mysteries at the Museum" and "Monumental Mysteries." America's vast network of national parks -- dense expanses of virtually unexplored wilderness -- offers breeding grounds for the unsolved and unexplained. Each hourlong episode presents several perplexing stories detailing unusual events at sites including Montana's Glacier National Park, Pennsylvania's Gettysburg National Military Park, California's Shasta National Forest, and Puerto Rico's El Yunque National Forest.