Located along the Trillium Gap Trail – off the Roaring Fork Motor Nature Trail – Grotto Falls is a nearly 3-mile-long, round-trip hike that runs behind a 25-foot waterfall. Summer hikers love ...

You can walk behind the 25-foot high falls at the Grotto via the Trillium Gap Trail ... turn off the main parkway in Gatlinburg at traffic light No. 8, then follow the Historic Nature Trail ...