Check out my most popular post, 15 Tips for a Girl Wanting to Hike the Appalachian Trail
The Appalachian Trail is 2,185 miles long and YES people do hike the entire thing.
10 Things You Need to Hike the Appalachian Trail. (Great info even if you're not doing that one!)
Hope to hike the Appalachian Trail, the Pacific Crest Trail, the North Country Trail and the Continental Divide Trail