The Great Ocean Road is a 243 kilometre (151 mi) stretch of road along the south-eastern coast of Australia between the Victorian towns of Torquay and Warrnambool. The road was built by returned soldiers between 1919 and 1932, and is the world's largest war memorial; dedicated to casualties of World War I. It is an important tourist attraction in the region, as it winds through varying terrain alongside the coast, and provides access to several prominent landmarks including the nationally significant and iconic Twelve Apostles limestone stack formations. The road is single lane (one in each direction), with the majority covered by an 80 kilometre per hour speed limit.