Spanning some 521,000 acres, Great Smoky Mountains National Park is most of the most biologically diverse pockets of the Appalachian Range. It's also one of the most beautiful, as this mossy shot captured by Felix Li proves.
A timeless image of a Shenandoah National Park sunrise, taken from the Ivy Creek Overlook along Skyline Drive. It could have been taken yesterday, or a century ago.
Snow levels can vary greatly in Glacier National Park throughout the year. While near the park's roof drifts are deep, here at Avalanche Lake there's comparatively little snowcover. Jane Timmerman came away with this photo on May 14.