Strange as it sounds, during the 1870s and 1880s, America's most popular spectator sport wasn't baseball, boxing, or horseracing--it was competitive walking. Inside sold-out arenas, competitors walked around dirt tracks almost nonstop for six straight days (never on Sunday), risking their health and sanity to see who could walk the farthest--500 miles, then 520 miles, and 565 miles! These walking matches were as talked about as the weather, the...