IMAGES of an unusual pyramid-shaped structure on Mars that look like those in Egypt have reignited wild theories about aliens ...

USA: Are these grainy photographs proof of mysterious, hidden alien structures on Mars? Probably not, but it has not stopped self-proclaimed alien and UFO 'experts' from claiming a series of images ...

From UFOs buried in the Sahara Desert to mysterious doorways in Antarctica, Google Maps users have made dozens of wild discoveries over the years. But the latest sighting is one of the strangest yet.