Known as "The Monster Mile," the Dover International Speedway opened with the name Dover Downs International Speedway in Dover, Delaware, in 1969. It has hosted NASCAR races such as the Mason-Dixon 300 and the Delaware 500 as well as USAC and Verizon IndyCar Series events. Exactly one mile in length, the track is one of three concrete racetracks (the others are Bristol Motor Speedway and Nashville Superspeedway) used in NASCAR's three main racing series.