America's 15 Best Foot Races

There's something soulful, primal, and downright animal-like about running alone in the woods or on a marathon course with thousands of other racers. It sure as hell beats running on the treadmill. So we considered a large number of America's foot races – trail runs, marathons, ultras, obstacle courses, local races – and picked the best 15. What makes these the best? In each case it's different. They range from the most prestigious (Boston) to the most difficult (Badwater) to the most-likely-to-include-nude-runners (Bay to Breakers), and everything in between. Whether you're an accomplished ultrarunner or simply training for your first marathon, this list has something for everyone who thinks running is more than just exercise. Launch Gallery >>

– Jeremy Berger