Athens (Greece) - "Authentic Pheidippides' Run". Trace the legendary footsteps of Pheidippides on one of the most demanding ultradistance courses and the longest open-road run in the world. Distance: 485,3 km (Athens-Sparta-Athens) or 524,9 km (Athens-Sparta-Athens-Marathon). We uphold the highest standards of sportsmanship and fair competition, honoring the Olympic spirit that was born in Greece. Our route carefully follows the ancient path of Pheidippides, connecting participants with this legendary feat of human endurance. The Authentic Phidippides Run always takes place during the last ten days of November. www.authenticphidippidesrun.com