 The Milwaukee Mile hosted its first automobile race in 1903, and is one of the oldest tracks in the world, though as of 2019 is presently inactive.The Indianapolis Motor Speedway, opened in 1909, is a prestigious auto racing track which annually hosts the internationally famous Indianapolis 500-Mile Race (part of the IndyCar series), the Brickyard 400 (NASCAR), and the IndyCar Grand Prix (IndyCar series).The Road America and Mid-Ohio road courses opened in the 1950s and 1960s respectively.