The Appalachian Trail is the longest hiking-only footpath in the world, stretching 2,193mi (3,529km) through 14 states, from Maine to Georgia. Unsurprisingly, it’s no small undertaking. The overall elevation gain and loss is 464,500ft (141,500m); that’s the equivalent of hiking Mount Everest from sea level and back 16 times, and it takes five to seven months to complete. Maine is home to the most challenging sections of the Trail, including Mount Katahdin and Mahoosuc Notch. Looking for a nearby campsite? Naughty Pines makes an excellent base for hikers.