This trail goes on for at least 8 miles, and eventually connects up with several other trails in the area, but you only have to hike a mile or two to reach the Devil's Backbone. The Backbone is a line of rocks sticking out of the ground that looks like a bony spine. You've got to see this in person!
Starting from Taft and Eisenhower (highway 43) head west on highway 34. The has 2 lanes in each direction, the road will go down to one lane in each direction. The trail head is just a few minutes from this point. You will see a coffee shop (The Black Cup) on the right, after this bend you will see an old water tower on the right with a road before it. Turn right on this dirt road and you will see the a large Devils Backbone trailhead sign.
http://www.tripleblaze.com/trail.php?c=3&i=130