(credit: Aurich Lawson) When it comes to American sporting traditions, there are few events as storied as the Indianapolis 500. It's a 500-mile test of speed, endurance, and bravery that takes place at the end of May. It takes place at the Indianapolis Motor Speedway, a 2.5-mile (4km) race track that's not only the oldest of its kind but also the largest sporting venue anywhere on Earth.