Athens (Greece) - "Authentic Pheidippides' Run". Athens-Sparta-Athens 490 kilometers. 20-24 November 2025. The longest and toughest road race in the world. 12 Marathons in 98 hours. A race that honors the historic superhuman effort of the courier Pheidippides. With the bronze label of the IAU (International Association of Ultrarunners). The Authentic Phidippides Run always takes place during the last ten days of November. www.authenticphidippidesrun.com