The magnificent 12 Apostles in the state of Victoria, Australia. Created by constant erosion of the limestone cliffs 10–20 million years ago, the stormy Southern Ocean and blasting winds gradually eroded the softer limestone, forming caves in the cliffs. The caves eventually became arches and when they collapsed, high rock stacks were left isolated from the shore. Despite the name, there have actually never been 12 of these rock stacks. The entire coast is so beautiful and dramatic with its brilliant sandy yellow color!