In June 1998 a local pilot flying over the remote South Australian desert discovered an enormous drawing of an Aboriginal man hunting with a throwing stick made on the desert floor, about 60 km west of the town of Marree. The figure is 4.2 km tall with a perimeter of 28 km, making it one of the single largest geoglyph in the world. The figure is so huge it can only be seen in its entirely from above 3,000 feet.

Unlike many geoglyphs found around the world which were created by ancient civilizations, Marree Man is recent, carved into the landscape not more than 18 years ago. The figure was created by scraping off vegetation and soil, possibly by a GPS-assisted bulldozer, which experts estimate must have taken between four and eight weeks to complete. It was created in such secrecy that there is not one witness who could attest to its creation. Thanks to its remoteness, nobody had heard or seen anything, nor anyone has assumed responsibility for it. To this date, it remains one of the world's great unsolved modern mysteries.

Photo credit: Peter Campbell/Wikimedia