Facing off against the wild Wyoming backcountry is a tremendous experience, though proper preparation and certain precautions are important when considering any backcountry day trip or overnight pack adventure in Yellowstone. The park service runs an efficient campsite system, and Backcountry Use Permits are required. Sleeping under a canopy of stars is exactly why visitors venture out into untrammeled territory; Heart Lake is one of the park’s most popular destinations, with a 16.2-mile trail that extends to an 8,140-foot viewpoint over the lake and Factory Hill. The remote country near Tower Junction is the gateway to grizzly, elk and wolf territory. The 3-mile Lost Lake and Petrified Tree Loop begins at Roosevelt Lodge.