Mentioned by VacationIdea
25 Best Things to Do in the Great Smoky Mountains
"Grotto Falls is accessible via the Trillium Gap Trail, the trailhead of which can be found on the Roaring Fork Motor Nature Trail. On the 3-mile round trip, which is of moderate difficulty, hikers will traverse old hemlock forests in a peaceful atmosphere until they reach the falls. The trail actually leads directly behind the cascading water of Grotto Falls, offering a unique and gorgeous point of view for visitors, and the 25-foot-tall waterfall is a cool and beautiful destination."