Backpacker Magazine sums up the Black Mountain Crest Trail: "Climb over 10 peaks above 6,000 feet on this 11-mile shuttle-hike culminating at Mt. Mitchell, the highest point east of the Mississippi River."

Start your watch at the bridge over Bowlen's Creek, stop it at the observation deck on Mount Mitchell (or back at the creek if doing the out and back). 

Ryan Meulemans posted the route:

Cumberland Trail Three Gorges Segment Double - 68 miles - Chattanooga TN

This is a segment of the Cumberland Trail consisting of the Rock Creek, Possum Creek, and Soddy Creek Gorge's sections as well as the northern end connector trail from the Lower Leggett Rd trail head. 

cumberlandtrail.org/maps-and-guides/trail-segments/three-gorges/

Peter Hubbard posted the route (11/1/2016):

http://blueridgebartram.org/

https://cfaia.org/brasstown-bald-recreation-area-visitor-centers-in-georgia/

http://www.ouachitamaps.com/Eagle%20Rock.html

The Eagle Rock Loop is a 26.8 mile loop through the Ouachita Mountains of Arkansas made up of three trail, the Little Missouri, Athens-Big Fork and Viles Branch Trail.