The Indianapolis Motor Speedway is an automobile racing circuit located in Speedway, Indiana, in the United States. It is the home of the Indianapolis 500 and the Brickyard 400, and formerly the home of the United States Grand Prix. It is located on the corner of 16th Street and Georgetown Road, approximately six miles (10 km) west of Downtown Indianapolis.
Constructed in 1909, it is the second purpose-built banked oval racing circuit after Brooklands and the first to be called a 'Speedway'. It has a permanent seating capacity estimated at 235,000 with infield seating raising capacity to an approximate 400,000. It is the highest-capacity sports venue in the world.