The Barkley Marathons is a cult-like race that pushes participants to their limits, with only 10 finishers in its first 25 years.
The Barkley Marathons: The Race That Eats Its Young
The notorious "Escape from Alcatraz" race has a record-low completion rate, with only 10 participants achieving success in its 25-year history, earning it the reputation as the sports world's most elusive and secretive challenge.
