Among the weirder photos are ones purporting to show an "alien boot," a flying UFO, a mysterious doorway, metallic wreckage, a rock shaped like a human face, other strange carvings, an "alien" statue, ...

A supposed square structure spotted on Mars sparked speculation about alien archeological sites on the red planet. It's a fun ...

Mars Orbiter Camera photograph has sparked interest online, and it's even piqued the interest of Elon Musk. The picture shows a strange square shape on a region of Mars around 3 kilometres (1.9 miles) ...