The Milwaukee Mile is a 1.015 mi (1.633 km) oval race track at the Wisconsin State Fair Park in West Allis, Wisconsin, a suburb west of Milwaukee. Opened in 1903 as a dirt track, it is the oldest operating motor speedway in the world. Inside the main track, the infield holds a 1.8 mi (2.9 km) road circuit. Its grandstand and bleachers seat about 37,000 spectators.