The Marree Man is a geoglyph near the small town of Marree in central South Australia, which depicts an outline of an Aboriginal man hunting with a stick. At 4.2 kilometres tall, it has become the second largest geoglyph in the world. Surprisingly, its origins have been shrouded in mystery since its discovery in 1998, as no one has claimed responsibility for creating it. For all we know, it could've been you.