The Indiana State Fairgrounds Mile, the oldest continuously-operating automobile race track in the United States. Built as a horse track in 1892, it hosted its first automobile race on June 19, 1903.
The Indiana State Fairgrounds Mile, the oldest continuously-operating automobile race track in the United States. Built as a horse track in 1892, it hosted its first automobile race on June 19, 1903.
http://www.milwaukeemile.com/track_info/aboutIntroduction.asp
It also began as a horse track... as a private track around 1876, and purchased by the state in 1891.