5. American Discovery Trail
At an estimated 6,800 miles, the American Discovery Trail is one of the longest hiking trails in the world. Stretching from coast-to-coast, the American Discovery Trail passes through 15 states — Delaware, Maryland, West Virginia, Ohio, Kentucky, Indiana, Illinois, Iowa, Nebraska, Missouri, Kansas, Colorado, Utah, Nevada, and California.
The American Discovery Trail is unique because it is made up of a collection of both hiking and biking trails, with most of the trail allowing horses as well. It passes through 14 national parks, 16 national forests, and uses trail sections from 5 other National Scenic Trail systems.
Only a few people have actually completed the entire trail; most notably was Mike “Lion King” Daniel who was the first person to backpack the entire 6,800 miles in one continuous hike.