Google Sightseeing, a blog run by Alex Turnbull, James Turnbull & Olly Jackson, posts some of the interesting places on the earth from the satellite's eye. Courtesy Google Maps & Google Earth!
I found this Maree Man post when I passed. "Ploughed into the Australian outback in 1998 (by persons still unknown), the Marree man is a 4km figure of an aboriginal. It’s faded into the desert quite a bit now but the shape (and size!) is still quite apparent. Wikipedia says that it was probably created using GPS and earthmoving equipment. There’s a good page here which discusses the possible reasons for creating the art work." - Posted by Alex