Backpacker treks all of Yellowstone's trails, a feat that took 25 years
It took him 25 years, stretching from 1996 to 2022. He missed one year – 2020 – due to the pandemic. In all, Duell estimates he’s trekked more than 2,000
United States Leslie Smith Ken Duell Yellowstone Institute Yellowstone National Park Yellowstone National
Source: helenair.com