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The Indianapolis Motor Speedway, located in Speedway, Indiana in the United States, is the home of the Indianapolis 500-Mile Race and the Brickyard 400.

It was created in 1909, and is the original Speedway, the first racing facility so named. With a permanent seating capacity for an estimated 257,325 people, it is the highest-capacity stadium type facility in the world.

Considered relatively flat by American standards, the track is a two-and-a-half mile, nearly rectangular oval with dimensions that have remained essentially unchanged since its inception: four 1/4-mile turns, two 5/8-mile long straightaways between the fourth and first and second and third turns, and two 1/8 mile short straightaways, termed "short chutes", between the first and second, and third and fourth turns.

A modern infield road course was constructed between 1998 and 2000, incorporating the western and southern portions of the oval (including the southwest turn) to create a 2.605-mile (4.192 km) track. In 2008, the road course was modified to replace te southwest turn with an additional infield section, for motorcycle use, resulting in a 2.621-mile (4.218 km) course. Altogether, the current grounds have expanded from an original 320 acres (1.3 km sq.) on which the Speedway was first built to cover an area of over 559 acres (2.3 km sq.). Placed on the National Register of Historic Places in 1975 and designated a National Historic Landmark in 1987, it currently remains the only such landmark to be affiliated with automotive racing history.

In addition to the Indianapolis 500, the speedway also hosts NASCAR's Brickyard 400. From 2000 to 2007 the speedway also hosted the United States Grand Prix for Formula One. The inaugural USGP race drew an estimated 400,000 spectators, setting a Formula One attendance record. In 2008, the Speedway added the Indianapolis motorcycle Grand Prix, a Grand Prix motorcycle racing event.

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