Doris Haddock
Doris Haddock, a.k.a. "Granny D", an 89-year-old activist, retired secretary and shoe factory worker, walked from Pasadena, California, setting off on January 1, 1999 to Washington D.C., a distance of 3,055 miles (4,917 km). She walked for six days per week, with a mean speed of 10 miles per day, in an effort to call people's attention to campaign finance reform, taking 400 days to complete her walk.
Read more about this topic: List Of People Who Have Walked Across The United States