The Kariong Hieroglyphs are a collection of carvings inside a narrow sandstone crevice in Brisbane Water National Park, near Kariong, New South Wales.
Some pseudohistory enthusiasts consider them to be evidence of an ancient Egyptian visit to Australia, but experts agree that they were carved some time in the 20th century. In all likelihood various people have contributed to them over the years. Despite their recent origin, they are arguably one of the area's more interesting cultural sites. At any rate, they're an amusing practical joke.
I found a website that showed the approximate location of the carvings, and managed to find them fairly easily. I took the photographs below in November 2013.