1. Appalachian Trail
Location: USA
Distance: 3,500km (2,200mi)
Duration: 150-210 days
The “AT” is perhaps the most famous of the Triple Crown trails in the USA, passing through no fewer than 14 states! Made globally famous by Bill Bryson’s 1998 book A Walk in the Woods, more recently made into a Hollywood film starring Robert Redford and Nick Nolte, the trail passes through eight national forests, two national parks and crosses a road on average every four miles, making it easy to access the numerous trail towns along the way.