This mysterious square structure has been spotted on Mars - and, naturally, Elon Musk wants to investigate it. The incredible geometric shape - estimated to be 3km (1.8miles) wide - was first spotted by NASA's Mars Global Surveyor's Mars Orbiter Camera (MOC) but has been brought to the wider attention by podcaster Joe Rogan. He is Mr Musk's friend and, amid chatter between the pair on X, the owner of SpaceX revealed he wants to visit the mysterious structure. The 53-year-old entrepreneur,