The main attraction on the Great Ocean Road is the rock formation known as the 12 Apostles. The eight (not 12 as one would assume) limestone pillars (up to 45m-high) were formed by erosion, and it was erosion that caused one of these pillars (there were originally nine stacks) to collapse in 2012.
The rock formation is part of the Twelve Apostles Marine National Park, which operates the visitor centre 7km east of Port Campbell. The visitor centre has a cafe, some informative displays about the 12 Apostles and other rock formations nearby and a network of walking tracks and boardwalks that enable you to get a good view of the 12 Apostles. There is also a helicopter company based at the centre that offers scenic flights in case you want to get some killer photos of the 12 Apostles.
This part of the Great Ocean Road as several similar rock formations that are just a short drive from here. These include Loch Ard Gorge (just a three-minute drive west of the 12 Apostles) and London Arch (formerly known as London Bridge before part of the formation collapsed in 1990 leaving two tourists stranded).