Lewis and Clark National Historic Trail
Though it is short on backcountry landscapes, one of the most accessible trails in the nation is the Lewis and Clark National Historic Trail. This route runs for more than 3,500 miles from Illinois to the mouth of the Columbia River in Oregon. For the most part, it traces the route taken by the famed early 19th-century expedition led by Meriwether Lewis and William Clark. While this trail cannot be thru-hiked, many sections along the drivable route, including national forest lands, can be walked, biked or even traveled on horseback.