An out and back up the Iron Crown, which at 2,126 m (6,975 ft) is the highest peak in the province of Limpopo. Start and finish is the local village (Haenertsburg) pub nestled at the foot of the Crown,which takes it name from the mountain. Apart from a few village roads which are tarred, the rest of the route consists of dirt jeep tracks and single trail, through forestry plantations, natural mountain grasslands and patches of indigenous bush. This particular route gives you just under 900m vertical gain in a little over 22kms.
 

A rails to trails route that is about 130 mi point-to-point. When fully completed the Northeast Texas Trail (NETT) will be the longest Hike/Bike and Equestrian Trail in Texas and one of the longest in the U.S.A.

100+ miles across Big Bend National Park.

The route begins with 50-mile traverse of the 311,000 acre Big Bend Ranch State Park. Hikers cross the Mesa de Anguila and approach the Chisos from the West, concluding the trip on the South Rim, Texas' pride and joy. This route offers exceptional navigational challenges. Expect off-trail navigation hazards through rarely traveled remote sections of these parks.

Route breakdown: trail=49 mi, dirt road/4WD roads=29 mi, sandy arroyo=14 mi, off-trail route finding=5 mi, paved road=3 mi

Scott Gilpin proposes starting / finishing an FKT at the Teatro Juarez in Guanajuato:

Starting from in front of Teatro Juarez, run to the cross at the top of "La Bufa", and return to your starting point. There are many possible variations - the posted GPX is what I found to be most efficient for myself. Others may find better options.