Gray's Arch Trailhead, D. Boone Hut, Martin's Fork, Military Wall and Left Flank Trails, Butterfly Hill, and back to Gray's Arch Trailhead. Gray's Arch Trailhead, D. Boone Hut, Martin's Fork, Military Wall and Left Flank Trails, Butterfly Hill, and back to Gray's Arch Trailhead. This area is covered in our Red River Gorge Trail Map: [img]http://www.outragegis.com/store/images/T/th_Gorge.jpg[/img] Buy this map