The Indianapolis 500 is an annual automobile race held at the Indianapolis Motor Speedway in Speedway, Indiana, United States. It is part of the IndyCar Series, a series of races organized by the Indy Racing League (IRL). The Indianapolis 500 is considered one of the most prestigious races in the world and is often referred to as the “Greatest Spectacle in Racing.” It is held on Memorial Day weekend and is the biggest single-day sporting event in the world, with over 300,000 spectators in attendance each year. The race is 500 miles (800 km) long and is held on a 2.5-mile (4 km) oval track. The first Indianapolis 500 was held in 1911 and has been held annually since then, with the exception of the war years. The race is known for its high speeds, close finishes, and exciting action.