"The Knobstone Trail is Indiana’s longest natural surface foot path.  It is a popular backcountry trail that runs along high ridges which offer great views across the wooded hills of southern Indiana, and on clear days, even glimpses of Louisville and the Ohio River. The Indiana DNR manages and maintains the trail, with occasional assistance from a variety of volunteer groups, including the HHC." https://www.hoosierhikerscouncil.org/knobstone-trail/

Justin Contois posted the route (6/19/2014):

The Cross County Trail is a 40.5 mile trail located in Fairfax County, Virginia. It is made up of bike path, sidewalk, and dirt single track. More information, including maps, can be found on the CCT page.