The Indianapolis 500-Mile Race is the world's oldest major automobile race. Better known as the Indy 500 or the Indianapolis 500, it is held annually at the Indianapolis Motor Speedway (IMS) in Speedway, Indiana, United States, an enclave suburb of Indianapolis, Indiana. The event is held over Memorial Day weekend in late May. It is contested as part of the IndyCar Series, the top level of American Championship Car racing, an open-wheel open-cockpit formula colloquially known as "Indy Car Racing". The name of the race is often shortened to Indy 500, and the track itself is nicknamed "the Brickyard", as the racing surfacing was paved in brick in the fall of 1909, with the sole remaining bricks serving as the finish line.